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Sensor Type
Carbon Dioxide
Temperature / Freeze
Tool Type
Temperature Measurement
Battery Operated
LCD Display
# of Buttons
5 Buttons
Ease of Installation
Beginner (Installs < 10 minutes)
Extech Instruments
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Measures Carbon Dioxide, Air Temperature and Humidity with User-Settable High/Low Alarms
Extech Instruments CO200 Desktop Indoor Air Quality CO2 Monitor
Extech Instruments CO200 Desktop Indoor Air Quality CO2 Monitor
Extech Instruments CO200 Desktop Indoor Air Quality CO2 Monitor
Item# 90248
Price: Normally $269.99 
Hot Deal $227.70
Free shipping on orders over $175 - See Details


  • Checks for Carbon Dioxide (CO2) concentrations
  • Maintenance free NDIR (non-dispersive infrared) CO2 sensor
  • Visible and Audible CO2 warning alarm with relay output for ventilation control
  • Max/Min CO2 value recall function
  • Automatic Baseline Calibration (minimum CO2 level over 7.5 days) or manual calibration in fresh air

Essential Info

The Extech Instruments CO200 Desktop Indoor Air Quality CO2 Monitor checks for Carbon Dioxide concentrations. Visible and audible Carbon Dioxide warning alarm with relay output for ventilation control. It offers Automatic Baseline Calibration or manual calibration in fresh air, and features Max/Min Carbon Dioxide value recall function. Monitor air quality in schools, office buildings, greenhouses, factories, hotels, hospitals and anywhere that high levels of carbon dioxide are generated. It is a maintenance free NDIR (non-dispersive infrared) Carbon Dioxide sensor. With careful use, this meter will provide years of reliable service.


What's Included

  • Universal AC Adaptor
  • More Info

  • Indoor Air Quality displayed in ppm with Good (380 to 420ppm), Normal (<1000ppm), Poor (>1000ppm) indication
  • Displays Year, Month, Date, and Time
  • Measurement ranges: Carbon Dioxide: 0 to 9,999ppm; Temperature: 14 to 140°F (-10 to 60°C); Humidity: 0.1 to 99.9%RH
  • Specifications

  • Display: LCD
  • Sensor Type: Carbon Dioxide: NDIR (non-dispersive infrared) technology; Humidity: Capacitance sensor; Temperature (air): Thermistor
  • Response: Carbon Dioxide: <2min for 90% step change; Temp: <2min for 90% step change; %RH: <10min for 90% step change
  • Relay: 1A 30VDC/0.5A 125VAC
  • Operating Conditions: -10 to 60°C (14 to 140°F); < 90% RH non-condensing
  • Storage Conditions: -20 to 60°C (-4 to 140°F); <99% RH non-condensing
  • Power Supply: 5VDC (±10%), = 500mA
  • Dimensions / Weight:117x102x102mm (4.6x4x4"); 204g (7.2 oz.)
  • Important notes:
    Only defective exchanges for identical item within 30 days of purchase. No other returns allowed on this item. For defective returns after 30 days, please contact the manufacturer.
    Manufacturer contact information: Extech Instruments Corp, Tel: (781) 890-7440 Ext 200


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