YUSHI INSTRUMENTSï¼?We Are Manufacturer 20 years NDT experience,ISO, CE & RoHS certificated, this is how we keep superior quality and competitive offers for global valued customers Measuring Principle Eddy Current Method (NFe): measuring the thickness of non-conductive coatings on copper, aluminum, stainless steel and other non-ferromagnetic substrates, e.g. painting, varieties of anti-corrosion coating, powder spraying, plastic, rubber, synthetic material, oxide film and phosphate film, etc. Features Display: High Contrast Segment Liquid Crystal Display(LED Backlight) Measuring Range: 0-2000m Working Temperature: -10 ~ 50 Auto Power-off: Auto off after 3 minutes of inactivity Calibration Method: Zero calibration, One-Point and Two-point calibration Power Requirements: 2 AA size batteries, low-voltage indication function Size: 149mm X 73mm X 32mm (H x W x D) Weight: 200g including batteries Battery is not included