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Extech Digital Thermometer

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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 6 facial icons indicating indoor quality levels

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"The CO220 measures carbon dioxide (CO2), air temperature, and humidity with user selectable high/low alarms. Measures CO2 up to 9,999ppm and features six emotions to indicate indoor air quality levels. Visible and audible CO2 warning alarm. Displays year, month, day and time. Manually stores/recalls 99 readings.

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 6 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
Complete with AC adapter