mitutoyo dial vernier caliper 150mm x 0.01mm range0-150mm graduation0.01mm / 1mm/rev accuracy±0.02mm new designed dial movement for ultra smooth sliding and high shock protection. titanium nitride (tin) coating is applied to the sliding surface to increase wear resistance(except for 0-300mm and 0-12" model). can measure od, id, depth, and steps. lock screw for dial bezel and for holding the slding jaw position . models available with carbide-tipped od and id jaws. supplied in fitted plastic case.