[Accurate measurement, easy reading] Smooth metal wheel, loose finger design does not hurtthe ruler, quick reading measurement, easy reading [High-quality stainless steel, carefully forged] Selection of high-quality stainless steel forging, using hardened process, will not rust, more durable , longer life [Large screen digital display, clear readings] Digital glass mirror, metric and imperial 2 modes for switching freely [Flexible measurement, fixing nut] Rotate the 'nut for adjusting the tightness, fixed measurement (clockwise, counterclockwise) [laser scale, clearly visible] Laser engraving, fine forging process, the scale is clear, convenient and accurate readings Number of delivered parts: 1 Specifications: 150 mm 1.5V LR44 battery (without battery) Welcomemeet