• Displays Carbon Dioxide (CO2) concentrations
  • Measuring range: (CO2) 0 to 9,999ppm
  • Maintenance free NDIR (non-dispersive infrared) CO2 sensor
  • Readings displayed in ppm with six facial icons
  • Audible CO2 warning alarm
  • Calculates dew point and wet bulb values
  • Automatic baseline calibration function
  • Manually store/recall 99 readings


The Extech CO220 Air Quality CO2 Monitor measures Carbon Dioxide (CO2), air temperature and humidity, plus calculates Dew Point and Wet Bulb. User settable high/low alarm function is perfect for monitoring air quality and insuring proper air ventilation in conference rooms, schools, greenhouses, factories, hotels, hospitals and anywhere that high levels of carbon dioxide are generated.