Perfect Prime CO2008 Carbon Dioxide CO2 Temperature Humidity Monitor Large LED Screen, Thermoemter/Hygrometer Wall mounted Large LED CO2/Temperature/Humidity Indoor Envirmental Monitor CO2 measurement range: 0 - 9,999 ppm (Typical 400 ~ 2000 ppm) , Precision: 70ppm 3% reading Temperature measurement range: 0-100C, Accuracy: 0.30C / 0.6F (10 ~ 55F/50 ~ 131F) Humidity measurement range: 0.1-99.9% RH, Precision: 3% (0-80C) Dimensions: 39.5 (L) x 29.5 (W) x 4.2 (D) cm