Mitutoyo 530-118 Vernier Calipers, Stainless Steel, for Inside, Outside, Depth and Step Measurements, Metric, 0 inch/0mm-200mm Range, -0.03mm Accuracy, 0.02mm Resolution, 50mm Jaw Depth 1.Hardened stainless steel construction with satin chrome finish, for protection of caliper. 2.Four-way measurement capability for outside dimension (od), inside dimension (id), depth, and step measurements. 3.Raised sliding surfaces to help prevent defacement and wear of scale graduations. 4.Modest, 14-degree face angle on vernier scale, to help improve visibility and reduce the possibility of parallax errors. 5.Meets federal accuracy specifications ggg-c-111b.