These mechanical outside micrometers are the standard/classic micrometer design for most high-precision outside dimension measurements when higher resolution than a caliper is required. - Operators open the jaw with the thimble and 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. Range / 0 to 25mm Resolution / 0.01mm Includes / Spanner and Case Lock Nut Type / Ring