Self-leveling Rotary Laser red beam Green beam Rotary Laser level 500m range Leveling AccuracyHorizontal: ±20" Vertical: ±20"Leveling Range±5°Measuring RangeDiameter:500m (Using the laser deterctor)Spinning Speed0,60,120,300,600 r.p.mDirectional-Scanning Angle0°,10°,45°, 90°, 180°Slope-adjusting Range±5° (Bi-directional )Light SourceLaser Diode, wavelength: 635nmDown Point Diode Accracy: ± 1mm/1. ...