Review on 0-5000ppm Relative Humidity Detector Temperature by Brock Chisholm

Extremely accurate and easy to use. Having taken readings in all of our buildings, it now continues to stay in the main boardroom, where the readings fluctuate between 420 in the early morning when no one is arriving, and 853 at noon, which is still well below the level I'm at heard we have to maintain CO2 to know we had good air exchange.