Extech SD800 CO2/Humidity/Temperature Datalogger

CO2, Humidity and Temperature datalogger, capable of measuring, displaying and storing simultaneously
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Extech CO2/Humidity/Temperature Meter (SD800)

This lightweight datalogger is capable of measuring, displaying and storing CO2, temperature and relative humidity readings simultaneously on its triple LCD display.

Using its maintenance-free dual wavelength NDIR (non-dispersive infrared) CO2 sensor, the SD800 can measure up to 4,000ppm as well as temperature to 50°C and humidity from 10 to 90%RH.

The SD800 datalogger stores its readings on an SD card in Excel format, meaning all your date/time stamped information can easily be transferred to a PC for your convenience.

  • Checks for Carbon Dioxide (CO2) concentration using its maintenance free dual wavelength NDIR (non-dispersive infrared) CO2 sensor
  • Triple LCD simultaneously displays CO2, Temperature and Relative Humidity
  • Measures CO2  (0 to 4,000ppm), Temperature (32 to 122°F / 0 to 50°C) and 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
  • Includes 6 x AAA batteries, 2G SD memory card, universal AC adaptor, and mounting bracket

What's In The Box?

  • Extech SD800 CO2/Humidity/Temperature Datalogger
  • 6 x AAA battery
  • 1 x 2G SD memory card
  • Universal AC adapter
  • Mounting bracket


  • Range: 0 to 4,000ppm
  • Accuracy: ±40ppm (<1000ppm); ±5% rdg (>1000ppm)
  • Resolution: 1ppm


  • Range: 32 to 122°F (0 to 50°C)
  • Accuracy: ±1.8°F/0.8°C
  • Resolution: 0.1°F/°C


  • Range: 10 to 90%
  • Accuracy: ±4%RH
  • Resolution: 0.1%


  • Datalogging: 20M data using 2G SD memory card
  • Dimensions: 5.2 x 3.1 x 1.3" (132 x 80 x 32mm)
  • Weight: 9.9oz(282g)