PR1000-WS White Styrene Pocket Rocket

This is a unique and useful outside diameter caliper that fits right into your pocket!
For use by Engineers, Draftsman, Pipe-fitters, Contractors, Carpenters, Plumbers etc: ANYONE who needs to measure diameters! Just set the backplate against a round object so that it touches at 2 contact points, then swing the movable arm until it also touches. The READ  HERE edge indicates the diameter! Pipe sizes to 16 in. are displayed as well as fractional inch diameters from 1⁄16 in to 16 in. Included for easy reference is a Fraction/Decimal chart and a Nominal Size Pipe Diameter Table. Take the guess work out of measuring diameters!