5-30mm Inner Diameter Micrometer Centimeter Measuring Caliper Accurate Measuring Tools Metal Spiral Micrometers Measurin

Features High quality alloy measuring heads can be used for various internal size measurement fine workmanship and no burr Clear laser marking line for convenient reading The main micrometer body is made of stainless steel with chrome plated surface wear resisting and durable Designed with locking device precise machinery structure make it more intuitive and convenient to read Built in ratchet stop device ensures accurate repetitive readings Specifications Type Inside micrometerMeasuring Range 5 30mmMaterial Stainless steelPrecision 0 01mmWeight 300g approx Zeroing Clean the surface of measuring anvil heads with a soft cloth then rotate measuring device to make two measuring surface contact If two zero lines of differential sleeve and fixed barrel do not alignment use the following two methods to adjust Method I if the error is less than 0 02mm 0 001 use ratchet stop to lock screw tightly then use wrench to pull fixed barrel till two zero lines alignment Method II if the error is greater than 0 02mm 0 001 Step1 use ratchet stop to lock screw tightly then use wrench to loosen the ratchet stopand remove differential sleeve Step2 re align zero lines of fixed barrel and differential sleeve then put ratchet stop back on If necessary adjust it again using method I Note There is no need to calibrate micrometer during common use Micrometer only need calibration when it is severely worn Package Includes 1 x Inside Micrometer