The GLL2-80 is a 360 degree, self-leveling, dual-plane line laser. Capable of projecting constant lines on both vertical and horizontal planes, the unit is great for alignment and leveling applications. The GLL2-80 can quickly switch between dual-plane, vertical-only and horizontal-only modes. Bosch's proprietary Cone Mirror Technology reflects a laser beam to project bright laser "chalk lines" in 360 degrees. The GLL2-80 is accurate to within 1/4 in. over its 100-ft. range in normal mode. The unit can be switched to Pulse Laser Receiver Mode for bright light conditions or to cover longer distances.