Measurement Range: CO2: 0/999 ppm Temperature: 0/+50 °C Humidity: 10/90 % RH^Resolution: CO2: 1ppm, Temperature: 0.1 °C, Humidity: 0.1 % RH^Accuracy: CO2: 50 ppm ± 5% rdg Temperature: ± 1 °C Humidity: ± 7% RH (25 °C (25 °C, 10 °C, 10/90 °C %RH, No condensation required; Power supply: AC adapter; Size: 4.7 x 3.7 x 3.9 inches (120 x 95 x 100 mm); Weight: 7.5 oz (210 g); A monitor for environmental protection and improved working environment. ^Promotes moderate ventilation and improves efficiency in a comfortable work environment!