Product review (2 stars): Accurate but very slow response
The readings are very accurate for temperature, though humidity is the larger displayed value and that's less consistent. The major problem is that the response time is very slow.  Changing from room to room through a building it may take 30 seconds for a 2-3 F difference to stabilize. The transition from inside to outside and 40-50F may be as long as 5 minutes! I sometimes leave it in a location and go do something else and come back to check it later.

For that reason, not recommended for a hand-held field surveillance tool.