Features: _x000D_High quality alloy measuring heads can be used for various internal size measurement, fine workmanship and no burr. _x000D_Clear laser marking line for convenient reading. _x000D_The main micrometer body is made of stainless steel with chrome plated surface, wear-resisting and durable. _x000D_Designed with locking device, precise machinery structure make it more intuitive and convenient to read. _x000D_Built-in ratchet stop device ensures accurate repetitive readings. _x000D__x000D__x000D_Specifications: _x000D_Type: Inside micrometer _x000D_Measuring Range: 5mm~30mm_x000D_Material: Stainless steel _x000D_Precision: 0.01mm _x000D_Weight: 268g(approx.) _x000D__x000D__x000D_Zeroing:_x000D_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._x000D_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._x000D_Method II, if the error is greater than 0.02mm (0.001 "),_x000D_Step1, use ratchet stop to lock screw tightly, then use wrench to loosen the ratchet stop and remove differential sleeve._x000D_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._x000D_Note: There is no need to calibrate micrometer during common use. Micrometer only need calibration when it is severely worn. _x000D__x000D__x000D_Package Includes: _x000D_1 x Inside Micrometer _x000D_1 x Wrench _x000D_1 x Calibration Ring _x000D_1 x Packing Box_x000D__x000D__x000D__x000D_Note:_x000D__x000D_Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1High quality alloy measuring heads can be used for various internal size measurement, fine workmanship and no burr 2Clear laser marking line for convenient reading 3The main micrometer body is made of stainless steel with chrome plated surface, wear-resisting and durable 4Designed with locking device, precise machinery structure make it more intuitive and convenient to read 5Built-in ratchet stop device ensures accurate repetitive readings Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia