Johnson's 1721P is the ideal tool for quick spot checks of plumb and level or for working in tight spaces. Its strong rare earth magnets adhere firmly to any ferrous metal surface for maximum convenience. Accurately check plumb or level in tight spaces with the 1721P pocket level. It fits conveniently in your pocket or tool box, or can be worn on your belt using the included holster. This level features an oversized curved vial that reads from any angle and strong rare earth magnets that hold the level securely to ferrous surfaces for hands-free use.