Extech CO200 Desktop Air Quality CO2 Monitor with Digital Display uses a maintenance-free NDIR (non-dispersive infrared) sensor to measure CO2 levels and also takes temperature and humidity readings. The Extech CO200 has user-settable high and low alarms to alert to unsafe levels, can be used as a clock, and is an easy way to monitor indoor temperature and humidity.
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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