Product review (5 stars): Very happy with the purchase
I had originally bought it to detect a rise of carbon dioxide level from a gas fireplace. It showed me the effects of the fireplace on room air quality. I was concerned that the unit would be inaccurate for my purpose of use but found that it was indeed very responsive to changes in the room environment. I found it to be extremely sensitive to even just another person entering the family room. Over Thanksgiving I noticed a much higher level but then I realized that there were a lot more people at our house. After the company left, all returned to normal. Checked the calibration by setting it outside and it appeared to be very accurate. The humidity readout shows within 1% of the other humidity sensors in the house show. All in all I am very satisfied with the unit and its operation.