Features Versatile Measurement Range: Designed for internal diameters from 5 to 30mm, this tool provides measurements for a variety of applications and projects High Accuracy Readings: Achieve 0.01mm precision with every measurement, ensuring reliable performance for profional and hobbyist use alike Construction: The stainl steel body with chrome plating offers exceptional wear resistance, extending the life of your tool for long-term use User-Friendly Design: Features a clear laser marking line and a locking device, allowing for intuitive and convenient readings without any hassle Reliable Repetitive Measurements: Equipped with a built-in ratchet stop device, this gauge ensures consistent accuracy for multiple readings over time 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