SPI Digital Micrometer - IP54 Rated Protection Features Include... 3-4" / 75-100 Measuring Range 0.00005" / 0.001mm Resolution Carbide measuring faces Standard included above 0-1" range Inc./Abs. measuring Spindle dia: 0.250 Accuracy: 0.00020" Friction Thimble Spindle lock Includes Certificate of Calibration Furnished in fitted case