Stanley 43-518 16-Inch FatMax Lighted Level,Stanley,43-518" /> Lighted vials and utile surface provide superior visibility of the vials & surroundings in low light conditions; patent pending Maxedge bridge provides a continuous marking surface and an open line-of-sight to the center vial from challenging angles (patented) Shock absorbent end caps provide added protection to high-wear areas for added durability Rare earth magnets provide twice the holding power of traditional magnets to ensure the level stays affixed to the work Uses 3 AA alkaline batteries will provide more than 100 hours of useable light.