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Extech FM300 Formaldehyde (CHÃ¥_O or HCHO) Monitor
Extech FM300 Desktop Formaldehyde (CH²O or HCHO) Monitor

Extech FM300 Formaldehyde (CHÃ¥_O or HCHO) Monitor

Part Number:FM300
temporarily out of stock - ships in 5 to 10 days

Extech FM300 Desktop Formaldehyde Monitor

(CH²O or HCHO)


Measures Formaldehyde concentration, Air Temperature and Humidity with user-settable audible alarm (0.08ppm by default). Excellent for monitoring indoor air quality of areas affected by formaldehyde gas.

  • Simultaneously displays Formaldehyde concentration, Air Temperature, and Relative Humidity readings with date (Year, Month, Day) and time
  • Visible bright LED (green & red) and three facial icons indicate indoor CH²O warning level
  • Audible beeping alarm default at 0.08ppm (adjustable)
  • Designed with Electrochemical CH²O sensor
  • Min/Max CH²O value recall function
  • Calculates statistical weighted averages of TWA (8-hour Time Weighted Average) and STEL (15-minute Short Term Exposure Limit)
  • CH²O Calibration function in fresh air
  • Internal memory for manually storing up to 99 readings with recall function
  • Complete with Universal AC adapter (100V-240V) and multiple plug types (US, EU, UK, AUS)


Formaldehyde is used in the manufacture of many industrial and consumer goods. Emissions from some of these items can rise when moisture and heat increase. These emissions are a contributing factor to Sick Building Syndrome, which may lead to itchy eyes and throat, as well as headaches and dizziness.

  • Glue
  • Paint
  • Insulation / Plywood / Fiberboard
  • Timber Paneling / Particleboard
  • Cosmetics
  • Shampoos
  • Soap Bars / Body Wash
  • Lotions
  • Toothpaste

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