Bosch GPL-2 2-Point Self-Leveling Laser LevelThere's no waiting for a standard plumb bob to stop moving around thanks to a quick settling pendulum. Two point laser unit transfers point from floor to ceiling for fast, accurate layouts; accuracy is + 1 8" at 30' Smart Pendulum System self levels, indicates out of level condition and locks when switched off. Compact design allows the unit to go anywhere and can be used in almost any interior application. Multi purpose attachment positions the mount