SPI Digital Micrometer - IP54 Rated Protection Features Include... Carbide measuring faces 0-4" / 100mm Measuring Range 0.00005" / 0.001mm Resolution Chrome plated frame Standard included above 0-1" range. Inc./Abs. measuring Spindle dia: 0.250" Friction Thimble Spindle lock Certificate of Calibration Furnished in fitted case Included in this set... 0-1" Digital Micrometer 1-2" Digital Micrometer 2-3" Digital Micrometer 3-4" Digital Micrometer