The Bartec Digital Tread Depth Gauge, No. TDG50, is able to fit in a pocket and features an easy-to-read LCD display. The TDG50 reads out in millimeters, inches, decimals, and fractions. The range of measurement is zero to 1-1/32" and a working temperature of zero to 104 degrees F. It also features a zero reset at any position and a manual off and on button.