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Extech CO220

Contact Instrument Solutions

Extech CO220 desktop indoor air quality CO2 monitor with data logging capability, AC adapter, software and PC lead


The Extech CO220 is a compact desktop indoor air quality meter that measures and data logs CO2 level, air temperature, humidity and date and time. The CO220 also has the added capability to calculate dew point and wet bulb temperatures. With visible and audible low and high level alarms, this is an ideal instrument for indoor air quality (IAQ) diagnosis.

Typical applications include schools, hospitals, greenhouses, offices, factories and hotels.


  • Displays carbon dioxide (CO2) concentrations
  • Maintenance free (NDIR) CO2 sensor
  • Carbon Dioxide reading displayed in ppm with six facial icons indicating indoor air quality levels
  • Audible CO2 warning alarm in the event of concentration levels exceeding high or low level user defined set points
  • Minimum and maximum CO2 value recall function
  • Calculates dew point and wet bulb values
  • Calculates statistical weighted averages of TWA and STEL
  • Complete with AC adaptor


CO2 range 0 to 9999 ppm

CO2 resolution 1 ppm

CO2 accuracy ± (5 % rdg + 50 ppm) from 0 to 2000 ppm

Temperature range - 10 to 60 °C

Temperature resolution 0.1 °C

Temperature accuracy ± 0.6 °C

Humidity range 0.1 to 99.9 %

Humidity resolution 0.1 %

Humidity accuracy ± 3 % (10 to 90 %), ± 5 %(< 10 % or > 90 %)

Display LCD

CO2 sensor type NDIR (non-dispersive infrared) technology

Humidity sensor type Capacitance

Air temperature type Thermistor

Datalogging Up to 99 CO2 readings

Dimensions 155 mm x 87 mm x 82 mm

Weight 178 g

Support documents

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Extech CO220 user manual.pdf Extech CO220 user manual
Technical document
File type
Adobe Acrobat
Download (290 KB)
Extech CO220 indoor air quality monitor data sheet.pdf Extech CO220 indoor air quality monitor data sheet
Technical document
File type
Adobe Acrobat
Download (422 KB)