This formaldehyde detector can measures 8 parameters: Formaldehyde Concentration(CH2O), Air Temperature ( / ), Humidity (%) , Barometric Pressure (hPa, kPa, inHg, PSI) , PerpetualCalendar and Time display. Large LCD with white backlight, easy to turn the backlight on or off by press the backlight button. Warnning formaldehyde level, avoids formaldehyde pollution effects on human health. You can have a try. Features: Warnning formaldehyde level, avoids formaldehyde pollution effects on human health. Large LCD with white backlight, easy to turn the backlight on or off by press the backlight button. The perpetualcalendar, min reading, USB connecting symbol, date recording symbol, time display, hold mode, max reading, low battery warning symbol, power off symbol(non-auto power off), date recording full capion, formaldehyde mreasuring reading, air temperature reading, humidity reading, barometric pressure reading will be displayed on LCD screen. Hold function, press the hold button to freeze the current reading, press it again to exit this mode, but the time display will not be freezed under the mode. The measurement units are changeable, press the Temperature units button to switch / units, press the Barometric bressure buttonn to change hPa, kPa, inHg, PSI units. Equipped with max/min value measurement function to allows you to track the maximum, minimum of your readings for parameter each time you power on the unit. Recording function, press two REC buttons at the same, the REC icon will appear on screen and the meter will now begin logging datas. Low battery indicator, and auto power off (with override option). Wall-mounted through reserved hole or placed on the desklop through the foldable stand. Reading internal memory through USB cable (Data record function). Specifications: Name: Formaldehyde Detector Main material: plastics Display: large LCD display with backlight Powersupply: power adapter (included) or 4*1.5V AA batteries (excluded) Formaldehyde-range: 0-5mg/m3(out of scale) Accuracy: 0.01mg/m3 Response time: 10sec Temperature-range: -10.0 to 70.0 (14 to 158) Resolution: 0.1/ Accuracy: ±0.6/±0.9 (0 to 50/32 to 122), others±1.2 Humidity-range: 0-99.9% Resolution: 0.1% Accuracy: ±2% (10-90%) Barometric Pressure Range: 10 to 1100hPa/1 to 110kPa/0.29 to 32.48inHg/0.15 to 16.00PSI Resolution: 1Pa/0.1kPa/0.01inHg/0.01Psi Data logging: 9144 groups Operating condition: 0 to 50, 0-95%RH Storage condition: -20 to 60, 0-99%RH Sensor life: 3 years in normal conm Storage temp: -40 to 70 (-40 to 158) Item size: Box: 250 * 215 * 71mm / 9.84 * 8.46 * 2.79in Machine size: 162 * 124 * 30mm / 6.38 * 4.88 * 1.18in Item weight: 730g / 1.61lb Package size: 256 * 75 * 220mm / 10.08 * 2.95 * 8.66in Package weight: 805g / 1.77lb Packing List: 1 * Formaldehyde Detector 1 * Disc 1 * USB Cable 1 * Power Adapter