Features and Benefits: * .300 - 1.300 inch range * 0.0001 inch graduations * Digital readout to .001 in. * Packaged in a wooden box * Limited warranty Don"t waste time machining unsafe rotors, and be sure they are still safe after machining. Always measure the rotor thickness before and after machining. This is used precisely for measuring thickness of brake rotor surfaces. It provides accurate, quick measurements. Now with an easy to read digital display!