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Extech Digital Display Digital Thermometer Multimeter

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Checks for carbon dioxide (CO2) concentrations with maximum/minimum value recall function
Maintenance-free NDIR (non-dispersive infrared) CO2 sensor
Indoor air quality displayed in ppm with good (380 to 420-PPM), normal (less than 1,000-PPM), and poor (greater than 1,000-PPM) indication

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The CO200 is a desktop indoor air quality CO2 monitor that measures carbon dioxide (CO2), air temperature and humidity.

Checks for carbon dioxide (CO2) concentrations with maximum/minimum value recall function
Maintenance-free NDIR (non-dispersive infrared) CO2 sensor
Indoor air quality displayed in ppm with good (380 to 420-PPM), normal (less than 1,000-PPM), and poor (greater than 1,000-PPM) indication
Visible and audible CO2 warning alarm with relay output for ventilation control
Humidity from 0.1 to 99.9% RH
CO2 from 0 to 9,999-PPM
Temperature from 14° to 140°F (-10° to 60°C)
Complete with universal AC adapter