Product review (1 stars): Cheap inaccurate junk!
Cheap inaccurate junk!.  I run a humidifier in the family room and wanted to check how the humidity spread across the rooms on the first floor.  This unit always reads about 37% humidity even though the reading on my humidifier rises and falls as the weather changes.  We had a severe cold spell and the humidifier was running at full blast, but could not keep up.  The reading on the humidifier dropped to 28% while this unit was reading a nice and happy 37.  I brought it upstairs where the humidity is very low and it still was nice and happy at 36%. I even put it right next to the humidifier to see if it changed, but no change.  The temp is close, but that is not why I purchased it.  A total waist of money!