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

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.

I have both of these units stilling side by side in my office and they are 2-3% different. They came with double back tape so you can mount them somewhere, but the battery compartment is on the back, so if you mount these, you will have to tear them off the wall to change the batteries. Not bad for the price, as long as you do not need very precise reading.

2 units and extra batteries came in the box. Work well, does what its supposed to do.

I have 4 of these. Cant attest to the accuracy, but they all read within a % or two of each other.

Both worked fine and accurate

I bought 2 of the mini hygrometers and they are giving the same readout that I’m getting from my larger, costlier devices. The size is perfect for placement into mason jars. The additional included batteries were a nice bonus too! There are what appears to be clips on the side that I am unsure of how to use, but am happy with placing them either with the included double sided adhesive stickers, or simply standing/laying down.

Good cheap Hygrometer, The double sided tape it comes with is poor quality, use Gorilla tape instead.

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.

These are tiny yet I’m still able to read them. I love them. I use them in my leopard geckos tank. I haven’t used the adhesive to put it up on the tank. I just stuck them inside on my hot and cool side. Works awesome. Same temps as what my heat gun is saying. Love that there was extra batteries in the package too!!

TLDR; don’t expect pinpoint accuracy, but it’s reliable for general readings. Good purchase for its price point. I have no need for scientific measurements; I just need to make sure the air is wet enough for my plants without spending an unreasonable amount. If you buy a pack of two, you notice the two will show different readings for both humidity and temp, and there’s not really a way to calibrate these. However, the readings are still within 1 or 2 degrees of each other. And from testing by transitioning from normal room humidity to the inside of my tropical plant enclosure, it’s definitely able to pick up the changes in humidity within a minute or so. Another note: leaving these in 90%+ humidity for a long time (maybe 6hr+?) will cause the display to glitch out and become unreadable. Moving the device back to lower humidity will fix it if you wait a bit. And if not, just remove the batteries and put ‘em back. That usually fixes everything.