RoboVector is a five-beam, all-in-one square, plumb bob and level that is no bigger than a tape measure. Its gravity-driven pendulum is constantly leveling, so marks start and stay true (1/4 inch at 100 feet). The out-of-level sensor signifying that the unit has not achieved or has been disturbed from level status eliminates checks and errors. Its single-piece, diamond-cut beam splitter guarantees perpendicularity of five beams and preserves accuracy over time.