CO200 Desktop Indoor Air Quality CO₂

The Extech CO200 is a Desktop Indoor Air Quality CO2 Monitor. Measurement ranges are 0 to 9,999 ppm (CO2), 14 to 140°F (-10 to 60°C) for air temperature and 0.1 to 99.9% for relative humidity. It features Minimum/Maximum CO2 value recall, Year/Month/Date/Time display, and an Automatic Baseline Calibration (minimum CO2 level over 7.5 days) or manual calibration in fresh air. Comes with AC adapter and user manual.


  • 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 9999ppm

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