Extech SD800 CO2/Humidity/Temperature Datalogger

CO2 0 to 4,000ppm
Accuracy ±40ppm (<1000ppm); ±5% rdg (>1000ppm)
Resolution 1ppm
Temperature 32 to 122°F (0 to 50°C)
Accuracy ±1.8°F/0.8°C
Resolution 0.1°F/°C
Humidity 10 to 90%
Accuracy ±4%RH
Resolution 0.1%
Datalogging 2,000K data using 2G SD memory card
Dimensions 5.2 x 3.1 x 1.3" (132 x 80 x 32mm)
Weight 9.9oz (282g)

Complete with six AAA batteries, 2G SD memory card, universal AC adaptor, and mounting bracket

manual

Datasheets