4-Pack Mini Digital Thermometer Hygrometer Indoor Humidity Monitor Temperature Humidity Gauge Meter with Fahrenheit (℉) for Humidors, Greenhouse, Garden, Cellar, Closet, Fridge Etc by DWEPTU

I use these to monitor temp/humidity when drying herbs. They work great and come with speare batteries. After two years I have not had to replace the batteries though. Would buy again.

Recu sans collant 3m. Les batteries déjà dedans et aucun batterie additionnelle, probablement un retour qui m'a été envoyé. Rien n'est fonctionnel!

These are surprisingly nice. I keep cigars in an assortment of "tuperdoors". I throw one if these in each bin. Small, don't take up much room, just put a battery in them and they work. Can't believe how inexpensive they are, they even came with mounting tape and extra batteries. Seem pretty accurate as well, they all show the same temperature, and the humidity level usually reads within a couple of percent of the Boveeda packs.

The RH reading on all of those is about 10% off and they all show different readings. (I compared it with slightly more expensive and trustworthy hygrometers). There is no way to calibrate them. You could argue that you can make a mental note to remember how much they are off but at this point, it's just hard to trust this device for anything that involves precision work, namely curing cannabis.

Doesn’t read humidity correctly. 10% lower then it should be and all 4 in the pack are like this and you can’t calibrate them. If you want accurate humidity readings don’t buy this