Mitutoyo's dial indicators now offer users more stability and longer life, thanks to advances to the inner workings of the rack and pinion gear system. Shock resistance is increased with a more robust gear train, while contamination resistance has been dramatically increased with a tighter seal around the bezel and frame, and the elimination of a lifting lever screw. Features include... 0.500" Range 0.100" Range per Revolution 0.001" Graduations 0-50-0 Dial Reading Lug Back