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Extech® CO2, humidity, and temperature datalogger (SD800) monitors air quality in schools, office buildings, greenhouses, hospitals, and anywhere that high levels of carbon dioxide are generated. Records data on an SD card in Microsoft® Excel format for future use. Selectable data sampling rate of 5, 10, 30, 60, 120, 300, 600 seconds, or automatic. Virtually maintenance-free dual wavelength nondispersive infrared CO2 sensor. Triple LCD simultaneously displays CO2, temperature, and relative humidity.