GSM250 Desktop Indoor Air Quality CO2 Meter


Also displaying temperature and relative humidity, the GSM250 Desktop Indoor Air Quality CO2 Meter features a 3-color light bar that changes color according to CO2 concentration and offers easy reading from long distances.


The meter uses non-dispersive infrared waveguide technology and offers automatic baseline calibration for long term drift compensation or 400 parts per million manual calibration. The GSM250 features touch panel programming and a user-adjustable CO2 level arm with a disable function.


The meter requires power from a USB source from a computer, power brank or 5VDC wall adapter. It comes with a 10 ft (3 m) USB-C cable and wall mount.


  • Simultaneously displays CO2, temperature, and relative humidity
  • User-adjustable CO2 level alarm with disable
  • CO2 automatic baseline calibration (with disable) for long term drift compensation
  • 400ppm manual calibration
  • NDIR (non-dispersive infrared) waveguide technology
  • Desktop or wall mount display with light bar for easy reading from long distances
  • Touch panel programming
  • 3-color light bar (green/yellow/red) changes color with CO2 concentration
  • °F/°C selectable
  • Requires power from a USB source: PC, power bank, 5VDC wall adapter
  • Includes 10 ft (3 m) USB-C cable (for power source only) and wall mount
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