12 inches, magnetic aluminum reinforced torpedo level, aluminum reinforced frame, rubber magnetic working edge allows for hands-free use on ferrous metal surfaces, v-groove frame fits on pipe and conduit, tapered ends assure an easy fit into tool belts, tool pouches or work pant pockets, surround view vials reflects ambient light for easy read, over sized frame, 12 inches multi-pitch vial reads slope in 1/8 inches increment.