Testo 535 Ambient CO2 Analyzer is a measuring instrument with permanently attached probe, batteries and calibration protocol. Testo 535, the efficient CO2 analyzer and monitor for measuring indoor air quality. Bad air quality in rooms can lead to tiredness, lack of concentration and illness (Sick Building Syndrome) due to high CO2 carbon dioxide concentration (greater than 1000 ppm).
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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