Product review (5 stars): Good way to check your basement to assure humidity level
I have a dehumidifier in my basement, as most on the market, the internal humidity sensor is way off. To check accuracy and assure the humidity is around 55% I use the Extech 445815 Humidity Meter and sure enough, setting the dehumidifier at 65 brought the actual humidity to 54% and is keeping it there.