CO2/Humidity/Temp Datalogger Carbon Dioxide Concentration 0 to 4000 ppm Temp Range 32 to 122 F (0 to 50 C) Relative Humidity Range 10 to 95 Percent Humidity Accuracy +/-4 Percent Accuracy +/-5 Percent Resolution 1 ppm Display Triple Line LCD Data Storage 2G SD Memory Card Power Source (6) AAA Batteries and Universal AC Adaptor