The SPI 13-795-0 Digital Outside Micrometer is a micrometer that has a mechanical digit counter for quick and error-free readings. It has a painted steel frame with a plastic heat shield, a spindle diameter of 0.250 inches, and a graduation of 0.0001 inches or 0.001mm. It comes in a fitted case. MSC Part # 76832401 Mfr Part # 13-795-0 Big Book Page # 1760 Country of Origin China Features Carbide measuring face Standards included above 0-1" range/0-25mm Ratchet thimble Spindle lock Furnished in fitted case Maximum Measurement (Inch) 1 Maximum Measurement (Decimal Inch) 1.0000 Accuracy (Decimal Inch) 0.000100 Graduation (Inch) 0.000100 Thimble Type Ratchet Stop Calibrated Yes Rotating Spindle No Digital Counter Yes