
This solid-brass sliding pocket-size gauge is ideal for quick measurements of gemstones, metal stock, and ID and OD on the go. It features a smooth finish and fine, crisply stamped numbers and lines, ensuring a long, productive life; a thumb knob makes it easy to adjust the gauge to the desired reading, and a support plate makes easy work of measuring small or irregularly shaped items. The gauge measures in inches (1/16" increments) and millimeters (.1mm increments).