With a ball anvil and chamfered spindle, the Vernier Ball Micrometer is ideal for accurately measuring case neck thicknesses within an accuracy of 0.0001 inch. Accurately measures case neck thicknesses from 0-1" with accuracy within 0.0001" Ratchet stop ensures uniform pressure for measurement repeatability Spindle lock preserves measurement when removing cartridge case from micrometer Baked-enamel finish on C-frame provides durability Includes a plastic storage case