Mitutoyo 505-674 Dial Caliper, Stainless Steel, White Face, 0-4" Range, +/-0.001" Accuracy, 0.001" Resolution 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