This tool is a convenient tool for measuring the thickness of car brake discs.Vernier caliper for automobile disc thickness. You can measure the thickness of the brake disc without removing the wheel. Using electronic digital display, the reading is more accurate, which is convenient for you to grasp the use of the brake disc more accurately. Each digital gauge has been fully tested before ready to sell Featured RS232 Data transfer port, must connect with "VINCA DTCR-03" Cable (sold seperately NOT INCLUDED) to make data transfer to PC. Do Not Connect With Regular Usb Cable. Specification: Material:Metal Length: 240mm/9.4 inch Measuring range: 0-6"/150mm Reads in Inch/mm/Fraction Resolution: 0.0005/0.01mm 1/128 Accuracy: 0.002/0.05mm Display: 1/2 x 1 1/2 (13mm x 38mm) LCD Package Includes: 1 Piece Vernier Caliper Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.