Mitutoyo Micrometer 103-218: Ideal for measuring metal and non-metal workpieces, this outside micrometer comes with a ratchet-stop mechanism to provide uniform pressure on a workpiece for precise and repeatable measurements. In addition, this micrometer features a 3 to 4" range and a 0.0001" graduation. Mitutoyo Micrometer Features: These mechanical outside micrometers are the standard/classic micrometer design for most high-precision outside dimension measurements when a higher resolution than a caliper is required. Operators open the jaw with the thimble insert a workpiece between the measuring faces and close the jaws. The main scale is then read and then added to the graduations on the vernier scale to provide the exact measurement. They are commonly used to measure the outside dimensions of raw materials, whole workpieces, and features in production, QA, and inspection environments in both metalworking and other industrial applications. Vernier scale in inch units for taking precise outside diameter (OD) measurements Baked enamel finish for protection and durability of frame Satin chrome finish on thimble and sleeve helps resist rust and reduce glare Carbide facing on spindle and anvil provides wear resistance Range / 3 inch to 4 inch Accuracy / +/-0.0015 inch Long Form Calibration Certificate / No Dimension Type / Inch Included Certification / Certificate of Inspection Mechanical Display Type / Vernier Thimble Type / Friction/Ratchet