The Bosch GRL400H Self-Levelling Rotary Laser has a long working Range of 1300 ft. with Accuracy up to ±3/32\" at 100 ft. — Ideal for exterior applications. It has a robust design with a Glass-Enclosed Cage — for better protection and water/dust 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 and two large, Easy to Grip Carrying Handles, a carrying case and D battery.