This Coating Thickness gauge adapts Electromagnetic Induction principle and magnetic Induced EDD current. It can measure the thickness of non-metal coatings on metal . This unit is 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 Target Measure: Non-metal coating thickness on the metal 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 nonmetal coating on metal Accuracy: +/-0.03mm Minimum base diameter: 50mm Critical base thickness: 0.5mm Package Contents: 1 X Coating Thickness Gauge (Main Unit) 6 X Standard Pieces 1 X Instruction Manual Only the above package content, other products are not included. Note: Light 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.