Mitutoyo 500-171-20 Digital Calipers, Battery Powered, Inch/Metric, for Inside, Outside, Depth and Step Measurements, Stainless Steel, 0"/0mm-6"/150mm Range, +/-0.001"/0.01mm Accuracy, 0.0005"/0.01mm Resolution Hardened stainless steel construction for protection of caliper components Four-way measurement capability for multiple applications: outside diameter (OD), inside diameter (ID), depth, and step Digital, single-value readout LCD display in metric units for readability Position memory for retaining measurements Function control buttons on the face, for ease of use: Origin, On/Off, and Zero/ABS (Absolute Scale)