Features • Precision Measurement Tool - Achieve accurate internal diameter readings with a range of 5-30mm and an imprive accuracy of 0.01mm for reliable results • Alloy Heads - Benefit from high-quality alloy measuring heads designed for various internal size measurements, ensuring fine workmanship without burrs • User-Friendly Design - Enjoy clear laser markings that provide convenient reading, making it easy to obtain measurements quickly and accurately • Robust Construction - The main body is crafted from stainl steel with chrome plating, offering wear resistance and longevity for frequent use • Consistent Readings - A built-in ratchet stop device guarantees , repeatable readings, enhancing your measurement reliability during multiple uses Features: 1、 alloy measuring heads can be used for various internal size measurement, fine workmanship and no burr 2、Clear laser marking line for convenient reading 3、The main micrometer body is made of stainl steel with chrome plated , wear-resisting and 4、Designed with locking device, machinery structure make it more intuitive and convenient to read 5、Built-in ratchet stop device ensures accurate repetitive readings Specification: Features: 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 stainl steel with chrome plated , wear-resisting and . Designed with locking device, machinery structure make it more intuitive and convenient to read. Built-in ratchet stop device ensures accurate repetitive readings. Specification: Type: Inside micrometer Measuring Range: 5mm~30mm Material: Stainl steel Precision: 0.01mm Weight: 268g(approx.) Zeroing: Clean the of measuring anvil heads with a soft cloth, then rotate measuring device to make two measuring . 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 l 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 stop and remove differential sleeve. Step2, re-align zero lines of fixed barrel and differential sleeve, then put ratchet stop back on. If necary, adjust it again using method I. Note: There is no need to calibrate micrometer during common use. Micrometer only need calibration when it is sev Package List