Mechanical Micrometer Head Range 0 in to 1 in Resolution 0.001 in/0.0001 in Accuracy 0.0001 in Dimension Type Inch Mouting Hub Diameter 3/8 in Operation Type Mechanical Rotating Spindle (Yes/No) Yes Spindle Shape Spherical Thimble Type Ratchet Includes Spanner Lock Nut Type Spindle Lock Long Form Calibration Certificate No Maximum Measurement - Inch 1 in Minimum Measurement - Inch 0 in Scale Finish Chrome Spindle Diameter 6.35 mm Spindle Material Steel Standards JIS B 7502