HT 501 CO2 Detector Portable Air Quality Monitor Carbon Dioxide Detector for Home Office<br> Item Type: CO2 Detector<br> Material: ABS<br> Model: HT 501<br> Power Supply: 1 x 3.7V lithium battery(1200mah) (shipped with built in battery)<br> Recording Mode: Manual measurement<br> Instant Measurement Response Time: 1 second<br> Record Storage: 12700<br> Carbon Dioxide Measurement Range: 0 to 9999PPM<br> Accuracy: ±70ppm ±3% reading (0 to 5000)<br> Resolution: 1PPM<br> Temperature Measurement Range: -10 to 70℃ (14 to 158°F)<br> Resolution: 0.1℃/°F<br> Temperature Measurement Accuracy: ±1℃<br> Humidity Measurement Range: 0% RH to 99.9% RH<br> Accuracy: ± 3% (10 to 90%)<br> Resolution: 0.1%<br> Working Conditions: 0 to 50℃, 0 to 85% RH (non condensing)<br> Storage Conditions: -20 to 60℃, 0 to 90% relative humidity (non condensing)