Contractors that work with steel frequently want to have both hands free to position, fit, adjust and align metal materials. Rare earth magnets are a must. With its milled measuring surface and V-groove, it holds firmly on all steel materials, even round surfaces. This level has a vial that will measure horizontal/level with gradients of 1% and 2%, a vertical/plumb vial and a third 45 degree vial . This level is practical, precise, convenient, and robustly built.