Whether laying foundations, constructing walls, or building decking you can depend on the Expert Prolaser Rota-Line Self-Levelling Rotary Laser Level from Draper to ensure your construction is perfectly level. The device projects a 360° beam vertically or horizontally, with four adjustable rotation speeds & scan modes. Featuring both automatic & manual levelling, the device can be used even when working on sloping ground, with adjustable angles in both X & Y planes. Accuracy level of ±0.1mm per 1m Outdoor operating distance of up to 150m (with detector) Indoor operating distance of up to 50m (without detector)