As I live is a very humid part of the country, the TM005X is very useful product as I need to control the humidity in my home and garage. While I find the product useful, I have not found Honeywell TM005X to measure humidity very accurate. Watching the reading of the two remote sensors, the Honeywell TS33C, and the main unit in the same spot, none read the same and none agree with two other Acurite hydrometers that do read consistently the same. The Honeywell readings very over a range of 5 percent. I called and asked the manufacturer whether I had defective units and they said no, their TM005X and TS33C products readings will vary. I think they should be more accurate. The temperature readings all agree.