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Extech CO100, Desktop Indoor Air Quality CO₂ Monitor

  • Checks for Carbon Dioxide (CO₂) concentrations
  • Maintenance free NDIR (non-dispersive infrared) CO₂ sensor
  • Indoor Air Quality displayed in ppm with Good (0 to 800ppm), Normal (800 to 1200ppm), Poor (>1200ppm) indication
  • User programmable Visible and Audible CO₂ warning alarm
  • Displays Year, Month, Date, and Time
  • Max/Min CO₂ value recall function
Regular Price £298.80 Special Price £166.80 £139.00
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Availability: In stock

Ships tomorrow if ordered in the next 20 hours and 39 minutes!

Product Code
EXTCO100

Free Delivery

90-day Returns

Technical Support

The Extech CO100 is a desktop indoor air quality CO₂ monitor that measures carbon dioxide concentrations (CO₂) from 0 to 9,999ppm, air temperature and humidity. With user programmable visible and audible CO₂ warning alarm. Meter has a maximum/minimum CO₂ value recall function. Maintenance free NDIR (non-dispersive infrared) CO₂ sensor. Complete with Universal AC adaptor.

  • Checks for Carbon Dioxide (CO₂) concentrations
  • Maintenance free NDIR (non-dispersive infrared) CO₂ sensor
  • Indoor Air Quality displayed in ppm with Good (0 to 800ppm), Normal (800 to 1200ppm), Poor (>1200ppm) indication
  • User programmable Visible and Audible CO₂ warning alarm
  • Measurement ranges:
    • CO₂: 0 to 9999ppm
    • Temperature: 23 to 122°F (-5 to 50°C)
    • Humidity: 0.1 to 90%RH
  • Displays Year, Month, Date, and Time
  • Max/Min CO₂ value recall function
More Information
ManufacturerExtech
Manufacturer Part NumberCO100
GTIN0793950510001
Gas TypeCarbon Dioxide (CO2)
ManualDownload
DatasheetDownload
Function Range Resolution Accuracy
CO2 0 to 9999ppm 1ppm ±75 ppm or ±5% of reading
Temperature 23 to 122°F (‐5°C to 50°C) 0.1° ±1.5°C/2.7°F
Humidity 0.1 to 90.0% 0.1% ±5%
Display LCD with backlighting
Sampling Interval: 2 seconds
Overload Indication: "‐OL‐"
Sensor Type CO2: NDIR (non‐dispersive infrared) technology 
Operating Conditions ‐5°C to 50 °C (23 oF to 122 oF) at < 90 % RH 
Storage Conditions ‐5°C to 50 °C (23 oF to 122 oF) at < 90 % RH
Power Supply 110V～220V AC, output 6.0V DC ≥ 500mA (supplied)
Dimensions / Weight 117x102x102mm (4.6x4x4"); 204g (7.2 oz.)

Why choose Instrotech for your electrical test equipment?

With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:

  • Free UK shipping on all orders
  • Access to our knowledgeable technical support team
  • Available calibration services to maintain safety compliance
  • A 90-day money-back guarantee for complete peace of mind

We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.