Dave Bell RL4V Rotating Laser. With this laser you can level sites and set out profiles accurately, set out foundations, square walls and check for vertical. It is also a great set out tool for interior work. Install cabinetry, tiling, showers, transpose layout for down lights and flues. Virtually any interior job that requires a level or vertical reference. The remote control also saves power by allowing you to select only the laser you require. As well you can use the scan function to provide a highly visible line and move this to where you are working.The 519039 dual laser receiver that comes with this unit can pick up both rotating and pulse lasers. This really is one laser to do it all.