Durometer & Tread Depth Gauge - with silver case./ Durometer/ Racing Tire Hardness Tester/ Tire hardness changes as tires get older and even varies between new tires. Now you can keep track of exactly where your tires are. Be precise, don't guess./ Reads from 0-100 points/ Tread Depth Gauge/ Super accurate, easy to read, easy to use./ Calibrated in 1/32" Accurate to 1/128" (less than .010"!)/