STABILA STA-25245 - 3 Vial, 45 degree W/ V-Groove Magnetic 10"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