Features: Purpose: Measuring non-metallic coating thickness. Two modes: car/user.Car mode can be used without calibration, which can measure the coating thickness of three substrate materials–iron, aluminum, and zinc.User mode requires calibration before use, which can measure the coating thickness of substrate material for calibration. Three measurement ways: single measurement; continuous measurement; different value measurement.Three calibration functions: zero calibration; two-point calibration; basic calibration. Meaurement range: 0-1.8mm/ 0-71mils. Auto power off The instrument will power off automatically in two mins of no measurement, or in five mins after measurement. Any problems, feel free to contact us. Honor to serve you!