Product review (5 stars): It was a good price and I got it right away with my ...
I wanted to see if my dehumidifier was working so I got this device to check the humidity in my basement.  It was a good price and I got it right away with my Amazon Prime.  As far as I can tell it works exactly as described. I ended up getting a new dehumidifier and this temperature/humidity gauge showed my humidity went from 83% to 52% overnight.  It pretty much coincides with the dehumidifiers numbers.