Extech CO240 Indoor Air Quality CO2 Meter Handheld Tester for measuring Carbon Dioxide (CO2), Air Temperature, and Humidity and calculating Dew Point and Wet Bulb. Extech CO240 has a user selectable CO2 alarm setting to monitor appropriate conditions for various indoor applications, uses non-dispersive infrared sensor technology and has an easy-to-read dual display.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
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