Features:

• Checks for Carbon Dioxide (CO₂) concentrations with Max/Min value recall function
• Maintenance free NDIR (non-dispersive infrared) CO₂ sensor
• Indoor Air Quality displayed in ppm with Good (380 to 420ppm), Normal (<1000ppm), Poor (>1000ppm) indication
• Visible and Audible CO₂ warning alarm with relay output for ventilation control
• Measurement ranges:
• CO₂: 0 to 9,999ppm
• Temperature: 14 to 140°F (-10 to 60°C)
• Humidity: 0.1 to 99.9%RH
• Displays Year, Month, Date, and Time
• Automatic Baseline Calibration (minimum CO₂ level over 7.5 days) or manual calibration in fresh air