Range: 0-25.4mm, accurate to 0.01mm. Accurate to measure: There is a zero setting that makes the digital tire gauge more accurate to test and measure. Easy to read: Large LCD display, zero setting at any position. Wide applications: Preciva digital depth gauge can be used for tread depth, brake shoe wear and pad wear. Excellent quality: Made of good plastic, the tread depth gauge is durable, compact and lightweight. Product description Features: Large LCD display Manual power on/off Zero setting in any position Metric/inch interchange system Suitable for brake shoe tread depth and pad wear Specifications: Area: 0-25.4mm / 0-1" Resolution: 0.01mm / 0.0005" Oper. : 0-40C Battery: SR44 / LR44, 1.5V Size: about 11 x 6 x 1.2 cm Instructions: Step1: Zero in any position. Step2: Make the gauge vertical to the tire surface, and then insert the measuring rod into the tire depth, and you can see the number. PS: We advise you to measure several times and take the average. Tire wear limit 1.6 mm; Recommended replacement Frequently high-speed wear 3 mm; recommended replacement Regular rain and snow wear 4 mm; recommended replacement Package: 1 * Digital Gauge