Long-range high accuracy laser with great distance and high-accuracy, the RL-H5 Series is simple to use for checking elevations. Easy to use with electronic self-leveling, you press the power button and go right to work in seconds. If the RL-H5B gets disturbed on the job it re-levels itself automatically. The self-leveling motors are accurate to ±20 arc seconds. Long range operation need to shoot elevations up to 400 m from your laser? No problem – this instrument has the power and range to cover a 400 m diameter job site. With extended battery life, the RL-H5B provides up to 100 hours of continuous usage with 4 (D) cell batteries. All weather dependability With the IP66 rating, the RL-H5B is “job site tough” and can withstand dust, a sudden shower and even torrential rainfall.