Northwest Instrument NRL800 Rotary Laser with Slope Match Function • Horizontal Leveling Laser • Laser Beam: Horizontal • Wave Length: 635 nm • Leveling Accuracy: 1/16 in @ 100 ft horizontal • Operating Range: 2,000 ft with Detector • Self Leveling Range: +/- 5 • Self Leveling Method: Electronic Servo Motors • Bumper Sensor: On Board • Includes: Laser, Remote Control, Bracket, Rechargeable Batteries & Charger, Carrying Case & Manual • Tripod Adapter: 5/8 x 11 Thread