The body of the thickness gauge is made from high quality engineering plastics, lightweight and durable It is designed with a large digital LCD display for convenient data reading Support reset function at any position, metric and imperial system switch, manual power on/off and auto power off Suitable for measuring situations requiring special insulation and protection magnetic or anti-scratch Can be used to measure the thickness of paper, PU leather, sheet metal, jewelry, battery, magnetic materials, etc. Features: This thickness gauge has a large digital LCD display for convenient data reading. The main body is made from high quality, lightweight and durable engineering plastics. It is similar in shape to the micrometer, and the function is also similar to the micrometer, mainly used to measure the outer diameter of the tube or rod and the measurement thickness. Instruction: 1. Press the on/off button to turn on. 2. Check if it shows 0.00, if not, reset it by pressing the ZERO button. 3. Press down on the pressing bulge and place the coin inside then release the bulge. Read the measurement result and measure a few more times then calculate the average of the results to get a more accurate one. Specifications: -Measurement range : 0-12.7mm / 0.5inch -Resolution: 0.01mm, 0.0005'' -Precision: 0.1mm, 0.005'' -Temperature Operating temperature: 0~40 -Storage temperature: -20~70 -Relative humidity: 80% -Power supply: Button battery LR44/SR44 1.5V (not included) -Size: 110 x 60 x 20 mm -Screen size: 33 x 10 mm Package Contents: 1 x Feeler Gauge