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Building HVAC Monitoring. Indoor Air Quality Survey. Locate Combustion Fumes. FEATURES: - Non-Dispersive Infrared ( NDIR) CO2 sensor ensures long-term stability and durability. - 4 Measurements: CO2, CO2 Ventilation Rate, Temperature and Humidity. - Datalogging 75, 000 records with fast USB download. - Large, easy-to-read display: º C, º F, % RH, CO2 ( PPM) . - CO2 reading adjusted for altitude changes. - Measurement range from 0~ 10, 000 PPM. SPECIFICATIONS : CO2 Measurement Ranges 0 ~ 10, 000 PPM Accuracy + / - 75 ppm or 10% of the reading Humidity Measurement Ranges 0 ~ 100 RH Accuracy 2.5% at 10% to 90% RH Temperature Measurement Ranges 0º C ~ 70º C Accuracy + / - 1º C @ 25º C Signal Update Every 2 seconds Warm Up Time < 2 minutes Operation Conditions 0º C ~ 50º C ( 32º F to 122º F) , 0 to 95% RH, non condensing