Draper-Expert-39591-Digital-Tyre-Tread-Depth-Gauge-with-Stainless-Steel-Body-Draper-Expert-39591-Expert-Quality-metric-&-imperial-calibration-with-conversion-between-the-two-Zero-setting-control-allows-for-comparative-measurement-Clear-LCD-for-easy-reading-Measuring-range-0-25mm-0-1-resolution-0-01mm-0-0005-accuracy-177-0-05mm-0-0001-Supplied-with-SR44-battery-Display-packed-br-Draper-Expert-39591-Digital-Tyre-Tread-Depth-Gauge-with-Stainless-Steel-Body