Extech CO220 Indoor Air Quality CO2 Monitor

Key Features:

• Measures Carbon Dioxide (CO₂), Air Temperature and Humidity, plus calculates Dew Point and Wet Bulb
• Maintenance free NDIR (non-dispersive infrared) CO₂ sensor
• Carbon Dioxide reading displayed in ppm with six facial icons indicating indoor quality levels
• Calculates Dew Point and Wet Bulb values
• Calculates statistical weighted averages of TWA (8 hour Time Weighted Average) and STEL (15 minute Short Term Exposure Limit)
• Automatic Baseline Calibration function
• Audible High/Low alarm
• Displays Year, Month, Day, and Time
• Manually store/recall 99 readings
• Complete with AC adaptor