
This sturdy sliding pocket-size gauge is ideal for measuring gemstones, metal stock, and ID and OD on the go. It's solid stainless steel and features a smooth finish and fine, crisply stamped numbers and lines, ensuring a long, productive life. The gauge measures in inches (1/32" increments) and millimeters (1mm increments); a decimal equivalent chart on the back converts 1/16" and 1/32" increments to decimal form.