Unit is ideal for pipefitter, welder, jig builder or anyone who has to determine angles or do setup work. A lightweight, easy to use tool for determining angles, Includes two cast-in 25-pound pull magnets that hold securely to any steel surface. Unit has a 360-degree adjustable DSL with two 90-degree quadrants graduated in 90-degree quadrants graduated in 2-1/2-degree increments. Cast in are tables used to convert degree-of angle to rise-in-inches-per-foot or millimeters-per-meter. A groove on the bottom edge permits use on a small pipe.