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Extech CO240 Handheld Indoor Air Quality CO2 Meter

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  • Dual display of Carbon Dioxide (CO2) concentrations, Relative Humidity, Temperature and more
  • Maintenance free NDIR (non-dispersive infrared) CO2 sensor
  • Audible CO2 warning alarm when concentration level exceeds high user set point
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"Measures Carbon Dioxide (CO2), Air Temperature and Humidity, calculates Dew Point and Wet Bulb"

  • Description

    Extech CO240 Handheld Indoor Air Quality CO2 Meter

    Measuring Carbon Dioxide (CO2), Air Temperature and Humidity as well as calculating Dew Point and Wet Bulb, the Extech CO240 Handheld Indoor Air Quality CO2 Meter is the ideal instrument for environmental testing in buildings such as factories, hospitals or schools as well as enclosed areas like greenhouses.

    Featuring a maintenance-free NDIR (non-dispersive infrared) CO2 sensor and a dual reading display, the Extech CO240 offers a user-set audible CO2 warning alarm as well as online (real-time) datalogging to a PC using its included software and cable. It is also tripod mountable (tripod sold separately).

    Boasting MIN/MAX recall, data hold, low battery indication and auto power off (with the ability to disable it), the Extech CO240 comes complete with six AAA batteries, USB cable, PC software and a soft case.

  • Specification

    Carbon Dioxide (CO2)

    • Range: 0 to 9,999ppm
    • Resolution: 1ppm
    • Basic Accuracy: ±75ppm+5% of reading


    • Range: 14 to 122°F (-10 to 50°C)
    • Resolution: 0.1°F/°C 
    • Basic Accuracy: ±2.0°F/1.0°C


    • Range: 10 to 90%RH
    • Resolution: 0.1%RH
    • Basic Accuracy: ±5%RH (@ 25°C)

    Dew Point

    • Range: -32 to 118°F (-35 to 47°C)
    • Resolution: 0.1°F/°C

    Wet Bulb

    • Range: 12 to 118.8°F (-11 to 48.2°C)
    • Resolution: 0.1°F/°C


    • Dimensions: 6.1x3.4x3.2” (160x60x40mm)
    • Weight: 6.4oz (181.4g)
  • Product Documents

    Product Attachments

    View FileExtech CO240 Datasheet    Size: (282.14 KB)
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  • Delivery Information

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