Formaldehyde (CH₂O or HCHO) Features

• Alternately displays Formaldehyde concentration, Air Temperature, and Relative Humidity readings (cycles approximately every 6 seconds)
• Visible bright tri-colored (green, yellow, red) LED alarm indicator
• Selectable CH₂O unit as ppm or mg/m³
• Adjustable audible alarm for readings exceeding set point (default at 0.08ppm)
• ZERO Re-Calibration function
• Manual Temperature and Relative Humidity Compensation (adjustable)
• Designed with Electrochemical CH₂O sensor
• CH₂O Calibration function in fresh air
• Low battery indicator
• Complete with universal AC adaptor (including US, EU, UK, and AU plugs), and 4 AAA batteries