Mitutoyo 505-712 Dial Calipers, Inch, White Face, for Inside, Outside, Depth and Step Measurements, Stainless Steel, 0"-6" Range, +/-0.001" Accuracy, 0.001" Resolution, 40mm Jaw Depth Dial for measuring vernier scale for ease of reading Hardened stainless steel construction for protection of caliper components Four-way measurement capability for outside dimension (OD), inside dimension (ID), depth, and step measurements Titanium nitride (TiN) coating on beam surfaces for resistance to wear Inch system of measurement for high-precision readings