Features: 1.Large LCD display, clear to read the data. 2.A nice guide to indicate when to change tyre. 3.Zero setting at any position. 4.mm / Inch system interchange. 5.Manual power on / off, digital automatic display. 6.There is scale on the stretch pole. 7.Suitable for tread depth, brake shoe and pad wear. Specification: Product range: 0-25.4mm Difference:0.1mm Material: ABS plastic Net product amount: about 42g Product accuracy: 0.01mm Color:sliver/black/blue Battery 1 LR44 Batteries No Included Instructions for Use: Step 1: Press the power button to turn on the machine and check whether the display is normal. Step 2: The allowance for the measurement surface is on a flat surface, push the measuring rod to the end, press Zero to return to "0.00" Step 3: The measurement surface is vertically close to the tire surface. Insert the measurement rod into the bottom of the groove to display the measurement value. Package included: 1 x Car Tire Tread Depth Tester(3 colors are available) Note: It is recommended to measure several times in different areas of the same tire and take the average value, the result is more accurate