The bosch grl400h self levelling rotary laser has a long working range of 1300 ft with accuracy up to plusmn332 at 100 ft mdash ideal for exterior applications it has a robust design with a glass enclosed cage mdash for better protection and waterdust resistance ip56 it has fast horizontal electronic self levelling with a disturbance monitor that ensures consistent levelling accuracy on the jobsite it includes a rotary laser receiver that aids in detection at greater distances an