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

It reads the temp and humidity, both consistently read the same values within 2% and 0.3 degrees when I had them next to each other. This is all I expected from these. If you need anything more accurate than you’ll probably want to spend more money. I ended up buying four more of these to place around my house to keep track of temp changes. As for battery life I have no idea, I’d assume they last pretty long since they shouldn’t use much power. They did include extra batteries which is nice.

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.

Works for what I am using it for. (Monitoring 3D printer Filament in storage).

I got these for the inside of my bearded dragons tank, and they adhere to the tank, easily or easily to read seem to be accurate

Id buy it again because there are so many but I did have about 3 or 4 that didnt work. Some also dont match up.

Sturdy and stayed stuck on glass terrarium wall. Seems pretty accurate as they both matched up together before being placed in the terrariums. Placement for the sticky could be better or a permanent way of sticking as when the batteries need changed, it’ll have to come off, but that could also be a user error on my end. Overall recommend.

It’s a great purchase. The original battery was dead but the second free batteries make up for that. It’s pretty accurate.

I place them side by side and they give different readings. I understand that there might be a small difference as the add says but not a significant difference in measures of humidity and temperature. So if you are looking for accuracy these are not it. I may return them.

When placed side by side they give a different reading...close by about 1 degree but being side by side the reading should be the same and it is NOT.

Greetings! I have tested the two temp+humidity meters that I received as part of this order. I compared temp with several other certified thermometers. Unfortunately, the temp readings from these meters are higher by 10 or more degrees F. I would be grateful for advice on how to calibrate these meters. It would be great if I can exchange my current meters for ones that work accurately. Thank you!