Digital Flat Hygro/Themometer combo hygrometers are just what you need to accurately monitor the contents of your humidor. It's flat design ensures this accurate device does not touch your cigars to keep them in perfect condition, while pinpointing your humidor's temp and humidity level.
Decent hygrometer. What kind of replacement batteries does it take?
I got one of these. And it's nothing short of junk!
Now I understand why these things sell for so little money, they're either junk or not robust. Ordered one, pulled the battery tag, placed it in my humi and everything seemed to be fine, for like four days. Then the display went dead. I even spent a few bucks on a new battery which was stupid 'cause it still wouldn't work. Unless you purchase 100 of these for $0.10 each, you're better off paying more for one that will last longer than it takes for your humidifier to re-adjust the RH after you open the lid and drop this inside.