Desktop Formaldehyde (ch2o Or Hcho) Monitor

Desktop Formaldehyde (CH2O or HCHO) MonitorAlternately displays Formaldehyde concentration, Air Temperature, and Relative Humidity readings (cycles approximately every 6 seconds)Visible bright tri-colored (green, yellow, red) LED alarm indicatorSelectable CH2O unit as ppm or mg/m3Adjustable audible alarm for readings exceeding set point (default at 0.08ppm)ZERO Re-Calibration functionManual Temperature and Relative Humidity Compensation (adjustable)Designed with Electrochemical CH2O sensorCH2O Calibration function in fresh airLow battery indicatorComplete with universal AC adaptor (including US, EU, UK, and AU plugs), and 4 AAA batteries