1,Electronic self-leveling, 2,wide leveling range, 3,high precision and stability Specifications:Laser wavelength: 635 nmLaser class: Class IIAccuracy: ... up & down plumb beamSelf-leveling, and laser flashing when beyond self-leveling rangeSwitch-able between the continuous laser and the pulse laser, and compatible ... with the tripod by 5/8' thread Automatic 500m Range Rotary Laser Level Self-Leveling