MP3 Laser Plumb Bob with 90-degree reference laser dot for leveling. Combine traditional plumb bob ease with three-beam laser-accurate alignment. One-button operation transfers laser point from floor to ceiling, quickly and safely. Self-leveling settles 20 times faster than conventional methods. Plumb and align studs and walls, electrical applications and any work that requires floor to ceiling alignment or leveling. Tools->Hand Tools, Carpentry->Laser Tools