Measuring angles is a snap with Johnson's magnetic angle locator. It features a high impact molded body and an extra strong ceramic magnet that sticks to ferrous metal surfaces, while the V-groove edges fit perfectly onto pipe and conduit. Easy to read increments show 0 to 90 deg in all four quadrants on the durable acrylic lens and the sides are marked with length graduations for convenience - one leg shows inch graduations while the other leg shows metric graduations.