Specification Brand : Mitutoyo BulletPoint1 : Three-point contacts for self-centering measurement of the inside dimension (ID) of bores BulletPoint2 : Vernier scale in inch units for taking precise inside dimension (ID) measurements BulletPoint3 : Ratchet-stop mechanism helps provide uniform pressure for precise, repeatable measurements BulletPoint4 : Satin chrome finish helps resist rust and reduce glare BulletPoint5 : High-grade tool steel construction for durability ExternallyAssignedProductIdentifier1 : 4946368517964 ExternallyAssignedProductIdentifier2 : 04946368517964 IncludedComponents : Case ItemName : Mitutoyo 368-875 Holtest (Type ll) Vernier Inside Micrometer, Three-Point, 5-6" Range, 0.0002" Graduation, +/-0.00025" Accuracy ItemPackageDimensions_Height : 30.2 centimeters ItemPackageDimensions_Length : 14.5 centimeters ItemPackageDimensions_Width : 21.6 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : inside-micrometers Manufacturer : Mitutoyo Material : Alloy Steel MeasurementAccuracy : +/-0.00025" ModelName : GHJK00896 ModelNumber : 368-875 NumberOfItems : 1 PartNumber : 368-875 PowerSourceType : Hand Powered ProductDescription : Specifications: Type: Inside micrometer Measuring Range: 5mm~30mm Material: Stainless steel Precision: 0.01mm Weight: 268g(approx.) Zeroing: Clean the surface of measuring anvil heads with a soft cloth, then rotate measuring device to make two measuring surface . 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 Micrometer 1 x Wrench 1 x Calibration Ring 1 x Packing Box