3-Pack Mini Hygrometer Thermometer Meter Digital LCD Monitor Indoor Room Round Humidity Temperature Gauge for Humidors Home Greenhouse Babyroom Reptile Incubator， Monitor

Bought awhile ago and thanks to the extra batteries, still working.

We put these in a freezer to compare them with the mercury thermometers that we had to check them out. All of the thermometers had the same reading except one of the mercury thermometers which was 5 degrees below the rest. I've read that the mercury thermometers are more accurate than the digital or metal spring ones, but all of ours were within 1 degree of the others (except the bad one).The only bad thing about these for me was the size of the temp vs the % humidity digits. I would rather have both readings the same size or have the temp size larger than the humidity reading. However, when I looked at the ad pics, I saw that the humidity readings were larger than the temp readings. So, I suppose I can't dock a star for that.

Great products the only reason I gave it four stars instead of five is because there's no other way to just stick it to the glass I believe they're supposed to be put in a special hole in a terrarium but I don't have that so I'm going to have to buy some two-sided tape but other than that they are nice, very easy to read and a great value I mean they even give you extra batteries. So yes I would recommend but make sure you have the right thing to put them in or get some two-sided tape LOL

All three are in different environments and all work flawlessly. It's incredibly easy to switch between Fahrenheit and Celsius, and the battery life has been incredible. Great price for three!

So far these have worked fine. I use them in the AMS on my Bambu Lab 3d printer as well as in my dry box, that I sometimes print TPU out of. They are handy for letting me know when it is time to recharge my silicate crystals when the reading starts to climb.

All 3 showed up reading the same values, but they disagree significantly with my thermopro, which i trust reasonably well. Thermo reads 16% vs 22% on this one. I placed one in a vacuum bag with pla-cf filament dried for 24 hours in my space-pi drier and 40 grams of new silica gel. After an hour and a half it still reads 21%, which seems high. Another i put in a small ziploc bag full of brand new silica gel packets and it still reads 25% after an hour. Putting one inside my space-pi drier which reads 15%, i get a reading of 10%.. so i’m not sure that i trust these as far as i could throw a metric ton of them, but they’re probably fine for reference.

Throw 2 of these in grove bags and if they read over 62% your herbs are still to wet. Burp them bags until RH stays at 58-62 % Then seal long term. You're welcome 618 Grow YouTube.

All three of mine work! There's no nasty chemical stink to them like there often is to cheap plastic items. I do wish you could find something like this that has the temperature as the large number and the humidity as an afterthought. I mostly just care about temperature. But it's ok, the temp isn't too small, you can still easily see it at a glance. I'm happy with the purchase!