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Extech CO240 Indoor Air Quality, Carbon Dioxide (CO2) Meter

Extech CO240
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  • Dual display of Carbon Dioxide (CO2) concentrations and Relative Humidity, Temperature, Dew Point, or Wet Bulb
  • Maintenance free NDIR (non-dispersive infrared) CO2 sensor
  • Audible CO2 warning alarm when concentration level exceeds high user set point
  • Min/Max CO2 value recall function
  • Includes software and cable for on-line (real-time) datalogging to a PC
  • Automatic Baseline Calibration function
  • Data Hold, Auto Power Off (with disable), Low battery indicator
  • Tripod mount (tripod sold separately)
  • Complete with six AAA batteries, USB cable, PC software, and soft case
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Sale: $279.99
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Product Information

Indoor Air Quality, Carbon Dioxide (CO2) Meter

Measures Carbon Dioxide (CO2), Air Temperature and Humidity



Easy-to-use Extech CO240 Air Quality Meter measures Carbon Dioxide (CO2), Air Temperature, and Humidity. It also calculates Dew Point and Wet Bulb. User settable high alarm with audible beeper is perfect for conducting a quick check of CO2 level to help adjust the environmental conditions in an enclosed area, such as a greenhouse or nursery, to ensure optimal plant grown. It’s also convenient for testing the air quality in buildings such as factories, hospitals, conference rooms, schools, and anywhere that high levels of carbon dioxide are generated, to ensure proper air ventilation.

  • Sensors
  • LCD Screen
  • HOLD / Up Arrow Button
  • MODE / Left Arrow Button
  • SET Button
  • AC Adaptor jack
  • Tripod Mount
  • POWER () Button
  • (Max/Min) / Right Arrow Button
  • UNIT Button
  • Down Arrow Button
  • USB PC interface port
Battery compartment on rear of meter.


Specifications Range Resolution Basic Accuracy
Carbon Dioxide (CO2) 0 to 9,999ppm 1ppm ±75ppm+5% of reading
Temperature 14 to 122°F (-10 to 50°C) 0.1°F/°C ±2.0°F/1.0°C
Humidity 10 to 90%RH 0.1%RH ±5%RH (@ 25°C)
Dew Point -32 to 118°F (-35 to 47°C) 0.1°F/°C  
Wet Bulb 12 to 118.8°F (-11 to 48.2°C) 0.1°F/°C  
Dimensions/Weight 6.1x3.4x3.2" (160x60x40mm)/ 6.4oz (181.4g)    


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