[Precise measurement, easy reading] Smooth metal wheel, loose finger design does not hurt the ruler, quick reading measurement, easy reading [High quality stainless steel, carefully forged ] Selection of high-quality stainless steel forging, using hardened process, never rust, more durable, longer life [Large-screen digital display, clear readings] Glass digital mirror, metric and imperial 2 modes to switch freely [Flexible measurement, fixing nut] Rotate the nut to adjust the tightness, fixed measurement (clockwise, counterclockwise clockwise) [Laser scale, clearly visible] Laser engraving, fine forging process, the scale is clear, convenient and accurate readings Function: Auto power on and off, mm/inch change, key lock for zero position adjustment, reset to zero after power on (absolute system), reset to zero (zero adjustment) possible in every position. Maintenance: 1. Store the clamp in a clean, dry place (moisture can damage the device). 2. Thoroughly clean the measuring