HARFINGTON Metric Outside Micrometer 75-100mm Range +/-0.01mm Accuracy Micrometer with Ratchet Stop Metal Industrial-Grade Precision Measuring Tool for Machinist Engineer, Blue

["Size - Measuring Range: 75 - 100mm / 3 - 4 inch; Accuracy : 0.01mm / 0.0004\"; Overall Size: 220 x 108 mm / 8.7 x 4 inch (L*W); Packing List: 1pcs x Outside Micrometer.","Material - The spherical micrometer is made of ductile iron and alloy steel, which have high strength, high toughness, excellent stability and shock absorption performance. The overall structure is sturdy, durable and wear-resistant, with rust prevention performance and longer service life.","Feature - The professional micrometer adopts the principle of spiral micrometer, combined with clear scale lines and differential cylinder, the reading is intuitive and clear, effectively avoiding visual errors. Equipped with a ratchet stop mechanism, it can ensure uniform measurement pressure, coupled with high recognition scales, to achieve accuracy of measurement.","Application - The outside micrometer can be used to measure the external thickness or diameter of small parts, suitable for mechanical processing industries such as lathes, milling machines, and grinders. It is also suitable for precision measurement of small objects such as jewelry and jade, as well as data research in scientific research and teaching.","Note - When using, clean measuring surfaces and zero the micrometer (use calibration rod for >25 mm). Adjust zero with screwdriver and wrench. Measure vertically, rotate the force device until it clicks. Hold the heat shield: lock left, loosen right; use wrench for zeroing and locking. Regularly clean the surface and probe of the outside micrometer to ensure it is free of dust, oil, and avoid affecting measurement accuracy."]