This Coating Thickness gauge adapts Electromagnetic Induction principle and magnetic Induced EDD current. It can measure the thickness of non-metal coatings on metal surface. This unit is Perfect for manufacturing company, metal machinery industry, chemical industry, and commodity inspection especially in automobile trading. Auto power off mode designed to conserve battery life Zero, one-point and two-point calibrating Digital LCD display Comes with iron base and non-iron (aluminium) base Portable, user friendly and easy to carry even in pocket Compact design and easy to carry Provides Single, Continuous & Difference measurement mode with metric/imperial conversion Model Number: GM200 Special Feature: measure the thickness of non-metal coatings on metal surface Target Measure: Non-metal coating thickness on the metal surface Power Supply: 2 x 1.5V AAA battery(without battery) Display resolution: 0.01mm/1mil Operating Temperature: 0-40 Celsius Operating Humidity: 10-95%RH colour: yellow Material: ABS size: Item Height: 105mm Item Width: 30.6 mm Item Length: 62 mm Measuring Range: 0-1.80mm/0-71.0 mil nonmetal coating on metal surface Accuracy: +/-0.03mm Minimum base diameter: 50mm Critical base thickness: 0.5mm Package Contents: 3 X Coating Thickness Gauge (Main Unit) 18 X Standard Pieces 3 X Instruction Manual Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.