Specification AgeRangeDescription : adult Brand : Yuecoom BulletPoint1 : High quality alloy measuring heads can be used for various internal size measurement, fine workmanship and no burr BulletPoint2 : Clear laser marking line for convenient reading,built-in ratchet stop device ensures accurate repetitive readings BulletPoint3 : The main micrometer body is made of stainless steel with chrome plated outer, wear-resisting and durable BulletPoint4 : This Inside micrometer designed with locking device, precise machinery structure make it more intuitive and convenient to read BulletPoint5 : Any question or problem, do not hesitate to contact us,we will reply you within 18 hours. Color : Silver ExternallyAssignedProductIdentifier : 9438641583827 ItemName : Inside Micrometer, Internal Diameter Gage Gauge Hole Bore 5‑30mm Range 0.01mm Accuracy Inside Micrometer Set Hole Bore Internal Diameter Gage Gauge ItemPackageDimensions_Height : 4 centimeters ItemPackageDimensions_Length : 17 centimeters ItemPackageDimensions_Width : 9 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : inside-micrometers Manufacturer : Yuecoom Material : Stainless Steel ModelName : DONGSE ModelNumber : TYTOGEtf769uds0b NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : Yuecoomnwg8f2ep1o ProductDescription : Specifications: Type: Inside micrometerMeasuring Range: 5mm~30mm Material: Stainless steelAccurate : 0.01mmWeight: 268g(approx.) Zeroing: Clean the outer of measuring anvil heads with a soft cloth, then rotate measuring device to make two measuring outercontact. 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 when it is severely worn. Package Includes: 1 x Inside Micrometer1 x Wrench1 x Calibration Ring1 x Packing Box Note: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.