Mitutoyo 505-717, 6" Dial Caliper features slider displacements that are amplified by a rack-and-pinion mechanism and indicated on the dial that is graduated in .001 of an inch with .200" per revolution. The sharp jaw edges provide easy access to portions that ordinary calipers can not measure and these 6" Dial Calipers can measure depth or steps. An extra-rigid main beam is another feature of these 6" Dial Calipers. Furnished in fitted case.