Features • Precision Alloy Measuring Heads: Utilize high-quality alloy measuring heads for various internal size measurements, ensuring fine workmanship and a burr-free experience • Clear Laser Marking for Easy Reading: Features a clear laser marking line that enhances readability, allowing for quick and accurate measurements without strain • Durable Stainless Steel Construction: Constructed from stainless steel with chrome plating, this tool is wear-resistant, ensuring longevity and reliability under frequent usage • Intuitive Locking Device Design: Equipped with a locking device and a machinery structure, this internal micrometer offers intuitive reading for enhanced user convenience • Built-In Ratchet Stop for Accuracy: Includes a built-in ratchet stop device, guaranteeing accurate repetitive readings for consistent performance during measurements 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 stainless 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 stainless 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: Stainless 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 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 stop and 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 Package List