This jeweler's quick digital gauge accurately measures beads, stones and any small findings. It offers a large, easy-to-read display with hold, zeroing and readouts in either inches or millimeters. An easy-to-read digital display indicates ID and OD from 0–25mm with .01mm accuracy, and a knurled thumb wheel makes it easy to open the spring-loaded gauge. Press the "hold" button to keep the measurement displayed, then press it again to clear it; the gauge features auto shut-off after 2-1/2 minutes to conserve battery life. A CR2032 button battery and protective case are included.