Side by Side Comparison of: Eva-Dry vs AcuRite vs Ivation

This thing is a beast! It's like those silica gel packs on steroids.Forget recharging your dessicants in the oven, nope just plug this bad boy in! That is the only problem though, it has the plus sideways so it works best when plugged into an outlet that is sideways. Luckily I have 1 but I don't think everyone does. Though I wouldn't let that put you off. I am sure you could get it to stay in a horizontal outlet aka a normal one. The charge is about 10 hours but a little less or more isn't going to hurt anything or anyone.I use this in a safe & another in my closet. The one in the closet collects moisture much faster than the one in the safe. I do have some liquid in my closet though... don't ask! (;Pros:-Rechargeable-Good quality-Trusthworthy brand-Safe friendly-No oven needed-No harmful chemicalsCons:-Plugs in best to a vertical outlet-Can potentially leak the lil balls that suck up moisture

I got this for my guitar room and it does a great job keeping the humidity 40-50% in a room about 10x10. I have to charge it quite often in the summertime ( I live in NorCal) but I think if I added a 2nd one I would not have to charge as often. Charging is a breeze and sometimes I just leave it plugged in. Great little product for the $

This is a simple passive solution to keeping my valuables dry and safe from moisture damage. Once a month, I pull the Eva-dry and plug into an outlet for 24 hours then toss it back in your safe, closet, whatever (I know it says it recharges in 8-10 hours, but that only partially recharges it). You know it's working when the enclosed area is void of mildew odors with no signs of rust on metals.

Great for keeping my small safe dry and mildew free.I live in a humid area of California and have had issues with mildew inside my small safe before. I've used other products that tend to fill with liquid and are a pain to dump.With this I check the color of the beads once a month and when it needs it, I plug it in for an evening and it is ready to work for another couple months.I like this so much I am looking at buying a couple more to put in some closets to get rid of the other systems that require liquid dumping and a kitty litter like replacement.

The little box has kept my bathroom dry for over a month now. We have an old house with only one, very small bathroom. There are 6 people in my family and the bathroom gets a lot of use. When my boys and teenage daughter would get a hot shower the entire bathroom would steam up to bad the walls would drip within a few minutes. We have a ceiling fan/light but it just wasn't enough. I wanted a dehumidifier that was compact since we don't have any extra room in our bathroom but we needed something powerful enough to do the job. This little box is both!!! It has worked great! The colors on the front panel are easy to read when it needs to be "aired out". I simply took it outside where there is an outside outlet and plugged it in for a few hours, good as new! I would highly recommend this for small, damp spaces. Right now I have it hanging out our curtain rod from a hook that's included. There are small spaces where the dehumidifier is screwed together and I might tap some small nails into the side of my bathroom storage unit and try to hang it up. GREAT product for the money!!!

A couple years ago we bought a waterproof/fireproof safe by Sentry. In order to make it waterproof they use some sort of water based insulation, I'm not sure if this is unique to Sentry or an industry practice. What happens in our safe is that everything is soggy and even my passport became warped and had some mold on the outside. I kept throwing in those silica packets that came with clothing and other items we purchased and they did not effect the moisture level inside the safe. I came across this and really didn't think I had anything to lose by trying it, the price was definitely right.When I received it, the crystals were already blue. I charged it right away and put it in the safe the next day. It's been a little more than 1 month and I have not yet seen the crystals turn pink. Everything inside the safe is nice and dry, all the paperwork feels a lot more crisp. I won't call the people who can't discern the color an blind like another reviewer. I can imagine some units may not work or people may have trouble seeing inside just like any product you buy nowadays. For me, the blue is a very dark blue. As I haven't seen the pink yet, I cannot comment on that. Although mine seems to have lasted longer than the advertised time, my papers and such are still very dry so I believe it is still working. If your item is defective, I would definitely get a replacement since I find this product to be a life saver (or a safe saver as it is, har har). Hope this helps.Edit 10/2/2013: I came back to post a picture of the pink color beads. I glanced at other reviews trying to find mine, and I'm shaking my head that people think this is for a vehicle or will take the place of an exhaust fan in your bathroom. This is a passive device, despite having a plug. It's strength is really for small places that you open and find mold or for preserving items. Anyway, still going strong here. I'll post a picture of the beads.

This has been great for monitoring my reptile enclosure/vivarium (IJ Blue Tongue Skink). My lizard knocked it into her water dish and it sat fully submerged for at least several hours. When I saw and pulled it out, the screen was blank and water was pouring out of all the holes. I took out the battery and let it dry out for 5 days. Popped the battery in, and it works! I now have it wedged so she can't move it around. (I used another gauge and a temp thermal gun to verify it's still giving accurate readings.) It's also helpful to know the highs and lows for the past 24 hours, since sometimes it can really vary. This has helped me maintain a more consistent level of humidity. Would recommend for anyone needing to monitor tropical/humid reptiles or amphibians.

works great - very accurate and rugged tooI keep one in a grow tent and another clipped to the side of some er home grown herb bucket so I know how the plant is as well as the tent as a whole. dropped on the floor, dropped in mud and they still work great.I think I've just been lucky with my misuse but my special orchids bloom like crazy because these guys let me know exactly how my micro environment is doing.too big to use in 1qt canning jars tho.

I have tested this device against my other gauges and it has proven accurate, it is easily read, the memory of highs and lows are helpful when you're monitoring a room that may have issues or maintaining a walk in humidor or a room you want particularly dry like a server room.Another bonus is that the device comes with a clip that also has a magnet adhered to the back. I have mine stuck to a filing cabinet in a room I need to stay consistently dry.The price was great, have I any further need for a room hygrometer I will certainly be buying this one.

Good product bought 4 all were the same, for $10 great deal, a very good humidistat would cost $100. I compared all 4 together after 2 hours they were all the same, even though two are off by one it is more like .2 after the photo I started to move one when I came back they were all reading the same.

We purchased this AcuRite monitor to see how much of a temperate difference we see in our master bedroom (which has poor insulation) and the rest of the house. During the first week I hung this unit next to our house thermometer and found it to be constantly one degree lower than our house reading. I have not way of knowing which one is more accurate, although I did notice that they moved in sync with daily fluctuations. It was very nice seeing what the daily fluctuations were, especially as we have to dogs and could not monitor what the house temperature fluctuations were while we were gone to work.Subsequently, we moved the monitor to our master bedroom. Curing the colder spring months we found out master bedroom about 2-3 degrees cooler than the rest of the house. It was reassuring to know that the difference was not greater. During summer months, we have noticed a 3-4 degree increase in temperature in the same room (compared to the listed temperature on our house thermometer. Again, during summer, the temperature move in sync. We do not use the AC much, so were see enough temperature variations to make this comment worthwhile.

I purchased two of these as I wanted something digital and I liked that it recorded the highs and lows for each: humidity and temperature. Right out of the package they both read identical humidity and temperature which was great. I then brought them to my work and put them in a stabilty chamber to test against a calibrated expensive humidty guage at 63.3% RH and 25.x C. Both units measured within a single percent of RH and ready 25 C. I then calibrated the units in a nitrogen filled instrument with a calibrated unit. The calibrated unit read 0.0 % RH while both units read 16. I figured out that these units DO NOT work below 20 % RH and instead display 16 %. I then tested them in open rooms compared to a calibrated unit at 20-30% RH and these babies read within a single unit of % RH and about 0.5 degrees C. I have no way of calibrating them higher and not sure how high they will read accurately but I'm curious to see what they'll read outside in the rain. Otherwise they are great units for the price.

This was purchased for my Dad's safe, and worked well. I had purchased an earlier version for myself and have been quite happy with its performance in my safe. The improved moisture display was appreciated. Disappointed with the "new and improved" hook for hanging it in the safe. The older model uses a metal hook; the "new and improved" version is cheap plastic. Guess when this one breaks (and it will), I will have to fashion a new hook - guarantee that one will be of metal!

Not sure how much it actually did because the closet I placed it in still felt damp, but that's my fault because the closet is inside the bathroom.It lasts about 3 days before it needs a charge, which isn't bad!Probably best to spend the extra money on a proper dehumidifier, especially if you have a walk in closet in the bathroom and you want to protect your clothes.

Not a ton to say about this. You open the unit, remove the plastic wrap and set it into the safe. It's been about a week with slight color change noted in the window. I have to guess I've got a ot a week and a half or so before a recharge will be needed. Living in the south I may grab an additional unit to help with humidity but we'll see how long this unit goes between charges.

I live in major humidity. This works great to keep the pantry from a stench. Works just as well as those disposable ones but no mess. I read others complain of it releasing the moisture back into the air. Just plug it in outside use an extension cord. I give it a 4 star because it only stays dry a little less than a week before needing to be replugged when the disposable ones last way longer.

It's a slow way to absorb moisture out of a smaller space (bookcase, cupboards, closets or in areas between furniture and a moldy exterior wall) but it works. The beads are packed neatly inside the plastic casing and I dry out the beads downstairs in the garage AC outlet. Usually takes about 10-12 hours before the beads in the clear window turn back to a light orange color. $15 is the best price I've found for the Eva-dry 333.

This tiny little powerhouse works great for small areas where a monster sized dehumidifier wouldn't be practical. It uses little beads to absorb moisture ( about a cup full I believe ) and the indicator on the front changes color to show when it is full. A clever tucked in plug folds out from the back and you can plug it into an outlet where it is then able to dry back out enabling you to use it again and again. It also comes with a hook that attaches if you want to hang it in a closet or something. Great price, neat product.

Needed something inexpensive to monitor partially finished, below grade basement. Have a dehumidifier set to run automatically in the space but no way to ensure it was operating +/- to setting. After two weeks of acclimation, the two still don't match but they are w/in ~ 5% of each other. That's all I needed to have confidence I wasn't allowing mold, etc. Can't be sure which is more accurate but this gets me in the ballpark. If you need pinpoint accuracy this may not be the unit for you.

Seems accurate, works and functions fine. I would recommend the ThermoPro TP50 over this unit though because i like its design better, its more compact, cheaper, and comes with a battery. This unit is also unable to reset the ranges whenever you want unlike the ThermoPro TP50 that can do that.

Considering the low price, this is a great little device. When I first got it, about 60 days ago, I was extremely disappointed at the inaccuracy of it. Comparing it to other devices, the humidity and the temperature were each in error by close to 10 percent. However, I discovered that it was because I used a NiMH rechargeable battery, which is lower voltage than an alkaline battery (1.5v for alkaline, 1.25 for the NiMH I used). After 42 days, the device shut itself off completely; no "low battery" warning of any kind. When I replaced the battery with an alkaline AA cell, the temperature and humidity readings matched other devices closely. I experimented, trying different NiMH batteries, making sure they were fully charged. In each test, the temperature and humidity readings were off by about 10 percent when using a NiMH rechargeable battery, and the readings were accurate when using an alkaline battery. I would give this device 5 stars if the seller gave some information about the sensitivity to voltage; but they do not (as of December 2015).Another experiment I conducted with this device was to place it in a plastic bag with a small packet of desiccant in the bag. The humidity reading did in fact drop quickly, and matched the readings of tests I conducted with other devices. When I buy herbs, I place them in double-zip bags with desiccant to help preserve freshness and to prevent mold. But I always wondered how much difference the desiccant really made, and how many packets would be required to significantly lower the humidity inside the bag. It turns out that one 10 gram packet inside a 1-quart zip-lock bag lowers the internal humidity to below 10 percent. The desiccant packets can be dried periodically in a low-temperature convection oven, and reused. The AcuRite device is small enough, and easy to read while inside the bag, so is helpful to me for gaining some data to help keep my herbs fresher.

UPDATE - This helped me with adjusting the temp of my fridge (I do NOT recommend GE, check consumer reports at the library). Also adding a few full gallon jugs of water to the back of the fridge helped lower the temp swings that happen when you open the door (AcuRite keeps track of the lowest/highest temp for maybe 24 hours). Read up but it's probably not good to put easily spoiled items in the door and maybe the top shelf (depending on temp settings, fridge quality, etc)Original -I'll update later. For now it works fine after surviving some USPS brutality (you'll need an AA battery). When you turn it on it will SLOWLY start lowering the # on the temp display if your house is cool, I just assume it's taking its time to be more accurate. The display temp eventually matched my home's digital A/C temp setting. I learned that my A/C lowers the humidity a little too much. I hear plants can help that a bit, I recommend spider plants and snake plants for better home air quality, not sure about their effect on humidity though.

Very nice little hygrometer.With any hygrometer you should check the calibration if accuracy is a concern. Many can be off by 3-5% - not critical in some cases, but definitely critical in precision acoustic instrument building as I do.Checking calibration is simple - I follow the directions from http://www.hermitcrabassociation.com/pages/calibrate.html" A simple, easy to do at home means of calibrating hygrometers uses standard salt and a sealed container. Table salt, when used properly, will maintain an exact 75% humidity in a perfectly sealed environment. So, to do this, you'll need three items. First, obtain an airtight container such as a see-through tub with a tight fitting snap-on lid (the kind usually found in most kitchens). Alternately, a heavy-duty zip-lock bag will do. Second, you'll need about a teaspoon of salt. Third, any small, shallow open container is needed (to hold the salt in) such as a screw cap from a plastic bottle.Place the salt in its small container and add a few drops of water to moisten it. Don't dissolve it yet. With just a few drops of water, you'll get what you need, which is damp salt. Next, carefully place the salt in its small container, along with your hygrometer, into the airtight container. Please do not get any moistened salt on the gauge. Also, check to see that the starting point (current reading) is anywhere in the 40% to 80% range.Seal the container tightly. Note: if you have any doubt as to whether or not it is a perfectly sealed environment, double-it-up by putting it in a second container, or into a second baggie. Do not try to remove the remaining air trapped inside. Now, wait for at least 5 or 6 hours until the environment has stabilized. Do not open the container. Read the gauge's humidity % level. It should be exactly 75%. If it is not, note the deviation as being the amount your hygrometer is out of calibration. If for example, it reads 68%, the gauge is 7% low. If on the other hand it reads 80%, the gauge is 5% high"

Cheap, works like expected.Has fridge magnet on the back, belt clip, and desk stand.Reads humidity very clearly, and temperature.Only star off, is no 'reset' button.You'd have to take out the battery for a second, to get the numbers to reset (highs and lows in humidity and temps).It also has a Celcius/Farenheit button in the back, to switch temperature readout.It also has an indicator (little house on the top right) to indicate if humidity is too much or too low.50% humidity is ok.Lower, and some people get a dry throat feeling.Higher than 90 and the air feels, and smells moist.The readout frequency updates about every 15 seconds. When I blew in the vents, it took the device about 1 minute to come to a stop (in rising humidity), so it doesn't work immediately.Can't tell how long the battery will last, and a last con would be that it has no backlight, and no alarm/timer built in (you'd think for a small device like this, they would incorporate a clock, as well as a weather predictor?).

Updating after 4 months use: Not as bad as I thought. Works OK in my small safe, but humidity doesn't go below 30%. It does stay there for a long time, which is good. Clay desiccant bags will lower humidity to 10%-20%. This desiccant is OK and does work and perhaps lasts longer between recharges.Had I know then what I know now, I probably would not have ordered these. My earlier review is below this line. In hindsight, I was too harsh with that earlier posting.---------------------Not functioning well at all! I bought two of these for a small safe (Verifi Smart.Safe) also purchased on amazon. The safe is great, while the desiccants are not removing moisture well.I put one of these in the safe and expected that my moisture test card would should 10%-20% moisture quickly. Didn't happen. After a week, I thought I'd try both of these "magic desiccant boxes" in the safe. Little change. The color of the beads is unchanged, and the moisture level is only slightly changed.I also have some 1-pound CLAY desiccant bags. Any one of those works better than two of these.Not worth the money, in my opinion. Might make great paperweights.

I'm sure it does a good job where intended. I tried to use it in my kegerator to keep moisture down, but the cold temperatures seem to render it ineffective for that application.

It would work well for a box, like a gun safe, but not so much for the car. We were hoping it would help our car stay less humid, we live in Florida and the AC went out in the van. If all the windows are up and the doors and windows never open I am sure it would have worked perfectly. It lasted 2 weeks in the van before the beads were all pink. It did charge quickly when we needed to charge it. We ended up giving it to my Dad to use for his gun safe. He says it works great there.

If you have a humidity problem, this dehumidifier is not large enough for closet sized areas. It said something about hang it in a closet, and even comes with a hook to go over a hanger rod. By the terms "wireless" and "renewable", what it means is that it is a container of something like a desiccant that can be dried periodically out by means of a built in heater that you plug in for about 24 hours every 30 days. Then you unplug it and hang it in the closet again. It can be easily forgotten and not renewed rendering it non-functional for that period. I will be replacing mine with a dehumidifier that stays plugged in full time. I use mine in a gun cabinet and even a space that small had it needing to be renewed in 30 days. I cannot afford for it to fail if I should forget to recharge.

I purchsed this unit to clear up some of the mositure issues that I have in my bathroom. It was actually working fairly well to just here recently. I recharged the unit and hung it on the shower rod for the overnight hrs. Well needs to say it slim off the little hook that came with the unit and little balls inside of this thing went EVERYWHERE. And apparently when they hit water they explode and go flying everywhere. I spent like an hour picking this things up and vaccum them up. They really need a better cap designed, but it just flew right off when it landed. Wonder if you can get some more of the little balls, so that I could at least fill my unit back up??

Maybe I should have gotten the larger models. It seems that I have to refresh them almost once every two weeks. I have a 24 gun safe. Not sure the cubic dimensions. Maybe it is moisture from oils after lubricating my weapons. I am not sure. But they definitely turn color. I am waiting on a hygrometer to measure the humidity that exists inside the safe. I live in a humid environment during the summer months. I have my safe in a cool basement that is not included in my central A/C unit. And I an recently talking about having to refresh these during the winter months. I have also purchased other moisture absorbing products to assist and control moisture. I do not see any problems with rusting and it helps to keep all ammo as dry as possible. I keep metal ammo cans inside safe with as much ammo as i can fit.

It seems fine but I have four sources of humidity readings in my basement (two dehumidifiers, a "weather station" and this one, and they vary by about 30 degrees from high to low in the same area, with no two readings even close... so I have no idea which is the most accurate. This reads somewhere in the middle of the others. I like the fact that it gives the high-low range on temp and humidity, in addition to the actual (?) readings for each. I just adjust the dehumidifiers for how it "feels" there.

These are great! However.. they need better calibration. I bought quite a few of these because they work out well for a quick glance of controls in the garden. Having five of these lined up right next to each other they all gave a different reading. Not way off, but enough if you want a more accurate readings. For me it's not going to stop me from using them but I do think they could still be closer in calibration.

EDIT: Stopped working after about a year and a half of just sitting on a shelf. Bottom of the screen went blank, and fresh batteries didn't help.These things are really handy to have around the house. We burn wood in the winter, which necessitates using a humidifier to keep the air comfortable. This little unit lets us monitor how cold the house gets overnight, as well as the humidity level. It's small and can stand on its own, so we typically move it from room to room to make sure heat is getting circulated properly. This coming winter we'll probably order another one or two.

Good points: One unit read the correct temperature. The other unit was low by 2°F (1C). The RH on both units was accurate and responded quickly. The display is easy to read although most people expect the largest number to be the temperature, instead, that is the RH.Bad: The unit only works in whole numbers (integer) degrees Celsius. It then converts the temperature into Fahrenheit using those integer Celsius values. Some the temperatures are roughly displayed in 2°F steps. Most people want something with a tenth of a degree Fahrenheit reading. I hated it so much I gave one unit away. The other unit is only used for the RH reading.

PROS:- Affordable- Easy operation- Allows for the use of rechargeable batteriesCONS:- No backlit options. At nights, it is not possible to read the values.- Inaccurate reading and slow to reflect changes. Although my application is to keep an eye on the humidity of the space where my parrots are kept and so super precise readings are not required, there are discrepancies between identical units and in general by several stops in compare to other models. Some have reported drilling holes to increase air circulation for faster adjustments to the reading, but that is too much of a hassle.- I find it valuable to have a clock and date displayed as part of the panel.

I would love to give this a 4 or 5 star rating. The price is right. The temperature reading is pretty close to accurate, which is all I really wanted from this. I would agree with a lot of other reviews that point out the Humidity reading is hit or miss. I have two of these. I sat them side by side for a few days. The temperatures always agreed, but there was typically a 5 or 6 percent different humidity reading between the two. If one read 60%, the other read 66%. I live in Florida - it is alway humid. I really didn't buy these for the humidity information. However, if that is what you need, these may not be for you.

I don't think this works as effectively as others have portrayed. I have seen the videos of people putting this in a safe or a closet and then coming back to show a reduction in humidity with a meter. I have tried it and it did not do anything. There's always the possibility that I got a dud but in my experience this did nothing. You are probably better off buying a mini powered dehumidifier.

The beads aren't changing color as shown. Also photos of the item I received don't appear to match the item shown on the homepage. I've had the unit plugged in for the recommended 10-12 hours but beads are still showing multiple colors.

This is an odd one for me. I keep one of these in my safe and I've had no problems with humidity. The trouble is I can't begin to match up the visible crystals with the color scale on the front. To my eyes the crystals always look a shade of boring beige. If I had to go by the color I wouldn't have any idea where things stood with regard to moisture. As it is I just go through the drying process about once a month and let it go at that. Also, it does get hot enough when plugged in that I wouldn't want to leave it unattended for, say, an 8 hour day at work.

This renewable mini dehumidifier is simple, cheap and effective. I purchased these to sit in a closet and soap drying drawer and they have proved to be very effective here in the tropics. They are simple to use- when the indicator turns completely pink just plug it in an outside socket to release the collected moisture and then return to area you wish to keep dry.Update:After using this for one month- the colors originally changed but after a couple of weeks quit, even after plugging in and supposedly releasing moisture. The cabinet does not seem to be getting any dryer!

I bought one of these and a like one from another maker and placed them in a 10 gun wooden cabinet. I have hydrometers inside and I cannot see that there is any difference between the outside of the cabinet and the inside. I was expecting somewhat of a drop in the relative humidity within such an enclosed space. They do absorb some moisture because I have had to refresh them but obviously not enough to be worth the expense.

I have a very small studio apt and thought this would be a good way to keep the moisture down. It took about 2 weeks for the little beads to go from blue (dry) to pink (wet) and when I plugged it in to discharge, it gets hot like it says, but takes almost a full 24 hours to competently dry up. And even then, it doesn't get fully dry like it was new, its just gets somewhat dry. After putting it back, it turned pink again within a few days. And then another full day to discharge it. It seems like the more I use it (only a few times) the less it holds, like its worn out or something. I kinda gave up using this thing, I spend more time plugging it near the window to discharge, its not worth all the effort and electricity for the little benefit it provided. Maybe it would be good for a very small space like a tight closet, but not anything larger.

I bought this to monitor temperature and humidity under my plant lights. Worked fine for a while, then the second number on the thermometer faded so that it can only be view from an angle. So something in the device display is not working properly. I can see no visible damage to the display Everything else continutes to work. New batteries did not help. I used this under my plant lights to monitor temperature and humidity....so perhaps moisture or heat caused the problem.

It works for what i wanted.It seems to skip a degree though. I usually read 73-75-77, never see 74 or 76.But it wasnt needed for it's precision, and works for what i wanted it to.EDIT: Bought another that is more precise, to compare. Watching a climb of 75 to 77 degrees, this monitor stayed at 75 the entire time. Not very accurate. Only recommend if you are not worried about a degree or two of separation. Not what I wanted though.

I bought this a long time ago and it never worked, it would say 65 degrees f and ~25% all the time no matter what the temperature or humidity was. Clearly broken, but it was so cheap I wasn't going to return it.Recently I had it lying around and decided to open it up and see if there was anything interesting going on inside and lo and behold, I found a glaring problem. One of the legs of the temp/humidity sensor itself was never soldered on. There was solder on the solder pad where it should have been attached, but the leg was up and off to the left, nowhere near the pad.So I heated up my soldering iron and attached the detached leg. The monitor now works properly as far as I can tell. It's responding to temperature changes and humidity changes, though it's very slow to respond and I can't vouch for its accuracy yet.Bottom line, it's a poorly manufactured product, but if you have issues with it like I did, try opening it up and checking the solder joints. You might be able to fix it pretty easily.

I bought the AcuRite 00613 Indoor Humidity Monitor due to its being recommended at another website. For the past couple of weeks I have had the AcuRite sitting next to a Fischer synthetic hair hygrometer - the least expensive, higher quality hygrometer I had been able to find previously. With my Honeywell evaporative humidifier on during the nights and off during the days, the AcuRite consistently reads about 13-15%age points less than the Fischer. I actually have two Fischers, and the second Fisher (usually in another room) is currently reading 3%age points lower than the first Fischer as they sit side by side. Still, that is a 10-12 point difference. I do not currently own a sling psychrometer (one of the most accurate measures of humidity), so I can't be certain which hygrometer is the most accurate, but I do know I'd be putting my money on one of the Fischers. Also, after the first week of using the AcuRite with its very small slotted vents, I drilled 20 holes in the plastic case to promote air circulation. It made no significant difference. I will note that the unit is very responsive to changes in humidity - just breathe on it and the numbers rise quickly, just, I suspect, not very accurately.

My house has a weird humidity issue looks like. Disclaimer: My house is in a flood zone and we can see up to 12 inches of water in the crawl space sometimes. Yes, it scary!That said, I'm told that if you run the heater continuously; which is the case in my house as my wife is always feeling cold, the humidity falls to desert level conditions which would mean under 25%. The opposite happens in my house. In winter the humidity goes up when the heater is running continuously. A co-worker suggested that if there is lack of humidity, then it might be drawing humidity from some other source, which in my case would be the crawl space. But that theory does not hold good for the upstairs bedroom where the humidity goes up as well with running heater.Anyways, I'm sort of convinced this product is not doing what its supposed to be doing unless someone can tell me otherwise. So, I told Amazon customer service that I would like to return this. So, they sent me another one for free and told me to toss the first one in the garbage. The second one is way off as well...on the higher side. See the picture of both of them side-by-side showing different readings. They were in the same place together for quite sometime before I snapped the picture. The color variation is due to one being closer to the cabinet than the other. They are consistently showing different readings.

I purchased this hygrometer to use inside a terrarium in order to monitor temperature and humidity. Unfortunately, it only worked for a few days before it began malfunctioning, the characters on the display fading away until they were completely gone. It appears to me that the device could not handle the high humidity conditions of my terrarium.I like the design and features of this Acu-Rite device, but if it can't handle humidity without breaking down it's not much help to me.If anyone knows where I can get a device like this that can handle high humidity environments (90%+) please comment below as I haven't had much luck finding a reliable hygrometer.

I wanted this for my bearded dragon tank because the humidity inside it has been going up now that we are going into fall and have the A/C turned off. This has done absolutely nothing to help. Very disappointed.

These do nothing. Mine turns green (wet) when I dry it out by plugging in and turns yellow (dry) when soaked with moisture. I have this in a very humid refrigerator, and the color has never changed...always yellow (dry). These are a waste.

I bought two of these and will never buy one again.These things get extremely HOT. Not just warm, HOT.When I removed these from the outlet (wall socket) it was so hot I am surprised that it didn't start a fire. If only one was like this I would just assume it was a bad one, but when both are the same, then these seem pretty dangerous to me.They are both going in the trash.I would Not recommend these to a friend !!

Didn't seem to do anything for me. It gets extremely hot when "recharging" though which I know is normal but also worries that it will explode one day I'm not home.

it's not showing any colors like it states on the package as to when it's needs charging. its suppose to show pink or blue and it shows no color at all.

Did not work at all. I tossed it after about a month. No change in color in bathroom.

Have had this unit running for 24 hours now, and none of the readings are correct. Humidity reads in my apartment at 26% and the humidity level icon says its OK, which is NOT in a healthy range, according to the instruction manual. Also, it says my temperature is 79 degrees, and my thermostat reads 70 degrees. Not trustworthy. Don't buy this one!

I have had this now for a year and it is inaccurate by 5 degrees Fahrenheit. I have set the a/c in the house to 78 and it shows 73. I have also tested the area this sits with an infrared thermometer and that shows the temperature to be 77.8. I even changed the battery. Who knows how accurate the humidity sensor is. Not sure how this has so many good reviews.

purchased 6 of these over the past 5 yrs. and they worked great. Purchased 4 more in 2017 but they are way off. I lined all 10 of the ones we own in a row and the old ones all read within 1 degree or % of each other but the 4 new ones are way off. 9% humidity and 7 degrees which is huge discrepancy. All read different too.Used to be a good instrument for the money.

I bought this on Dec 22 2016. It worked well for months. Today (April 24 2017), only 4 months later, I noticed it was not on/working. I swapped out the battery for a new one and it still did not work. I tried 3 different batteries (including ones from my TV remote that I know to be working) and still did not work. Sad it didnt work longer.

Item is defective and has a terrible return policy. If you want to return it, you have to pay shipping and handling. After the company receives the product, THEY decide if it is defective.My product will not display anything below 53% humidity. I purposely put it in a low humidity environment and a high humidity environment for 24 hours each. I did the salt test and it displayed 72% humidity, which is close enough, but no matter what I do, it will not read below 53%.

Don't bother. Bought it mid January and two weeks after the return window to Amazon expired, the screen is displaying fragments of the numbers, i.e., the digital display is broken. Hasn't been dropped, submerged or damaged in any way. Apparently not good quality.