Check the listing for details. Pocket Sized Pipe Caliper. Condition: New. Listed at 27.98 USD. Pocket Sized Pipe Caliper: Precise Measurements from 1/4" up to 12"Calibrates to zero, and can change from mm to inches.2 in 1 Tool - Measures both Iron and Copper PipesMade from Zinc Plated SteelDie Punched Numbers - Will not scratch or fade with time Product descriptionThis unique measuring device helps determine the "pipe size" of the pipe in question quickly and easily. The pipe caliper is a two in one device which measures both Iron Pipe Size and Copper Tubing Size. INSTRUCTIONS: Open the movable wing and place the pipe caliper around the pipe between both wings. Simply close the wings so the pipe is touching both wings and the top of the caliper. Read the measurement on the caliper.IPS = Iron Pipe Size CWT = Copper Tubing Pocket Size Pipe Calipers are a must have tool for pipe insulators, plumbers, draftsmen, pipe fitters, engineers, and architects.