SPI Coolant Proof Electronic Micrometer Set Specifications include... 0-6" / 100mm Measuring Range 0.00005" / 0.001mm Resolution Features include... IP65 Rated Protection Carbide Measuring Faces 0.25" Spindle Diameter Painted Frame with Heat Shield Ratchet Thimble Include Certificate of Calibration Furnished in Fitted Case Included in this set... 0-1" Digital Micrometer 1-2" Digital Micrometer w/standard 2-3" Digital Micrometer w/standard 3-4" Digital Micrometer w/standard 4-5" Digital Micrometer w/standard 5-6" Digital Micrometer w/standard