GOODYEAR Prof Digital Tread Depth Gauge Goodyear Professional Digit Tread Depth Gauge accurately measure tread depth in either mm or inches. Includes large LCD screen for increase visibility and rubberized grip. Zero setting at any position. Suitable for thread depth brake shoe and pad wear. Includes on and off button switch. Works for passenger vehicles motorcycles trucks and SUVS. Includes 1X LR 44 Button Battery.