The Bosch GRL300HVG Self Leveling Green Rotating Laser features a 90 Plumb and Layout Beam. Bright Green Beam Laser For Better Visibility - 3x brighter than standard red beam. Full selection of beam visibility enhancements such as variable speed selection, variable scan angles for maximum visibility in all light conditions. Protected Cage for head assembly also provides access to quickly hand position the laser beam on a known point or work area. Electronic Self-Leveling in both Horizontal and vertical Position - With 90 layout beam for easy set-up and square layout. Full Selection of Beam Visibility Enhancements - such as variable speed selection, variable scan angles for maximum visibility in all light conditions.