3-in-1 Formaldehyde (HCHO), Temperature & Humidity Detector, Digital Portable Handheld Meter, Home Office Car Indoor Air Quality for Wood Furniture Cabinet Flooring Construction Renovation Check Measure HCHO (CH2O) Formaldehyde, Temperature and Humidity %RH Selectable measurement unit (mg/ppm), temperature unit (C/F) with large display Portable or hang on wall with backlight function, Environment Safety indicator Zero drift for formaldehyde reading 0~5mg/m Sleep mode function and with low battery indicator