The RCBS Electronic Digital Caliper measures from 0 to 6 inches (0-150mm) with an accuracy of +/- 0.001-inch (0.02mm) and a resolution of 0.0005-inch (0.01mm). It features a hardened stainless steel body for prolonged tool life and provides instant readings with large, easy-to-read numbers to reduce error during measurements.Key FeaturesMeasurement Range: Capable of measuring from 0 to 6 inches or 0 to 150mm.Accuracy: Provides accuracy of +/- 0.001-inch or 0.02mm.Switchable Units: Easily switches between inches and millimeters with the touch of a button.Zero Adjustment: Adjusts to zero at any position for convenience.Lock Feature: Lock holds the slide in position for measuring constants.