This standard specifies the terms and definitions, types and basic parameters, requirements, inspection methods, signs and packaging of lever micrometers. This standard is applicable to micrometer scales of 0.01mm, 0.001mm, 0.002mm, 0.005mm, measuring range of 25mm, indicator scales of 0.001mm or 0.002mm, and measurement upper limit ιmax Should be greater than 100mm lever micrometer.