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Why are two CO2 calibration kits available from TSI (1000 ppm and 5000 ppm)?

April 26, 2017calibration CO2 Kits TSI

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Why are two CO2 calibration kits available from TSI (1000 ppm and 5000 ppm)?

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Most people interested in indoor air quality calibrate at about 1000 ppm since the primary range of interest is between about 500 ppm and 1000 ppm. The 5000 ppm calibration kit is available for people interested in maintaining the highest possible accuracy when measuring higher concentrations.