Specifications RL-H5A Rotating Laser Level Accuracy: H: 10 arc seconds Self-Levelling Range: Horizontal 5 Working Area: 800m Rotation Speed: 600 rpm Dust/Water Rating: IP66 Operating Time: Alkaline (100 hours) ; Ni-MH (60 hours) Operating Temperature: -20C to 50C Includes Topcon RL-H5A Rotating