Checks for Carbon Dioxide (CO2) concentrations Maintenance free dual wavelength NDIR (non-dispersive infrared) CO2 sensor Triple LCD simultaneously displays CO2 , Temperature and Relative Humidity Measurement ranges: CO2 - 0 to 4,000ppm; Temperature - 32 to 122"F (0 to 50"C); Humidity - 10 to 90%RH Datalogger stores readings on an SD card in Excel" format for easy transfer to a PC Selectable data sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds or Auto Specifications Weight 9.9oz (282g) Dimensions 5.2 x 3.1 x 1.3in(132 x 80 x 32mm) Datalogging 20M data using 2G SD memory card CO2 0 to 4,000ppm Temperature 32 to 122"F (0 to 50"C) Humidity 10 to 90% Resolution 1ppm Accuracy "40ppm ( <1000ppm); "5% rdg (>1000ppm)