Product review (5 stars): I set these both up in the same room. ...
I set these both up in the same room. Within an hour they were withing .1 degrees of each other and the thermostats in the room. The humidity differed by about 3%, which is very minimal. For this price, the performance is an outstanding deal. I have one upstairs next to my regular weather station, which doesn't have humiidity, and the other downstairs in the partly stone wall basement to monitor the effectiveness of my dehumidifier.