Mini Hygrometer Thermometer 2PCS Mini Digital Humidity Gauge, AikTryee Hygrometer Indoor Humidity Monitor, Temperature Humidity Gauge Meter for Humidors, Greenhouse, Garden, Cellar, Closet, Etc

As others have stated, the hygrometers were operating out of the box since the seller already stuck the batteries in before shipping it out. Theyre small, light, and have a clear and easy-to-read LCD screen. I bought them to monitor humidity in my guitar cases, so their size and lightness are perfect for fitting into the little available space around the guitar and Im not afraid that theyll do any damage to the guitar if they come lose from their adhesive on their own (although itll be a different story if its from something like the guitar case being jostled around). They also come with double sided 3M tape strips and a new set of batteries per unit which makes this a very good deal. Also as noted by another reviewer, almost the entire back side of the unit is occupied by the battery door which means ideal places for mounting are limited to the narrower sides. While this made mounting a bit more finicky, theres enough surface area to be able to securely adhere the double-sided tape to the top and to the desired surface. It doesnt feel like itll come off unless I really pull on it. Out of the box, there was about a 1-2% humidity difference between the two units I purchased and temperatures were about .5-1 degree off. I reset them as specified by the seller in the Q&As by removing the batteries and leaving them out for about 10 minutes before putting them back in. After the reset, the difference in numbers was the same, but after about 5 minutes of acclimating and letting them sit side-by-side on their own, they matched each other exactly. Im assuming that the initial number differences may be due to very sensitive sensors that are reacting to the heat/moisture of your fingers after handling. I also think that the units do take a few seconds to register any changes in humidity/temperature, but that works perfectly fine for my purposes. For example, if youre moving it from a humid greenhouse to a dry exterior then youll probably have to wait a few minutes for the numbers to gradually ramp up/down. If you want more responsive hygrometers you may need to look elsewhere, but if your monitoring situations arent critically dependent on instant read numbers, then this is a perfectly adequate solution.

I use them in my humidor and they work great as a supplement to my analog one. They are always within a degree of each other so I am ok with the variance. They are so small so next I will add some velcro to the back and on the humidor so it can stay. I forsee alot of life from these and if not, they were cheap enough that I would buy again. Perfect for what they are made for.

I use these in my jars to monitor the humidity and it works for what it is but on the back where the battery enclosure is you push it down and slide it to open or close it and the it holds the battery in and pushes it against the connectors and if the door is loose the battery wont push against the connector enough resulting in the screen being faded its nothing serious I just used a little piece of tape and put it in the back side of the door to create more pressure, pushing the battery more against the battery terminal.

Great little way to keep track of enclosures temperature, it’s easy to install, easy to read and maintain a good time period fit battery life.

Ordered twice at different times, four pieces total. All placed in a sealed container at the same time. After twenty four hours- Relative humidity readings dead on with each other - 70%. Temperature readings within 0.4 degrees, three reading 73.0 degrees, and the fourth reading 73.4 degrees. Conventional thermometers included in the same container read 73.1 and 73.4 degrees. Thats pretty good accuracy/repeatability considering that the units cost less than $2.50 each. For all those complaining about accuracy/repeatability, what do you expect for less than $2.50 each. Youll be spending substantially more for units that use a more accurate sensor and are individually calibrated to give more accurate readings.

It is not accurate at ALL. Places it in the incubator with a govee just to see and while my incubator and govee showed 99.5 temp and 40% humidity, these showed 80 temp and 60% humidity on one and 82 temp and 70% humidity on the other. They were both placed right next to the govee in the same spot so should have read the same as govee or at LEAST read the same in both of them. They both read different from each other and not even close to the incubator or govee. Not worth it

I had really high hopes for this product. It does a great job at doing what it needs to do the only issue I had with it was it doesnt stay on the tank at all! I have a chameleon, a bearded dragon and two leopard geckos, I had gotten some for all of them. The thermometers only stayed on for a few days before falling off, the adhesive it comes with is just not very strong. Other than that it worked great.

Works well in humidor and wine fridge

I bought 6 and they all read +-1 of each other after 24 hrs. in the same zip-lock bag. I put one in each of my filament bags and change the desiccant when it reads over 20% at 60°f. Ive found you cant maintain a low enough humidity to keep filament from taking on moisture above about 65°f and 20% is a good cutoff for getting too high. 19% (or lower) always yields good print results. Moisture symptoms start to be detected above20%. Im planning to get another 6 or so. Several months have gone by and the batteries are still fine. No telling how old they were already when they arrived.

Product exactly as described, came with double sided tape pads, large numbers and easy to read; measurement are consistent between the two within 1 degree and consistent with my side of tank heat indicator strip within about 3 degrees. For the price, this is a reasonable set that will give you a good idea of temp and humidity. May not be exact, but then again... these things rarely are exact. For my purposes, the 1-3 degree difference is not a big deal. Also came with extra batteries which is a huge plus since they are little button batteries and I would have to order more. Now I can change them when they go out and go ahead and order new ones without having to take them out of the tank, see what kind, and then wait several days to get them. Would buy again.