The Johnson 40-6519 rotary laser system is the perfect tool for any number of leveling applications - indoor and outdoor. The rotary features horizontal self-leveling as well as manual leveling in the vertical plane, while its split beam establishes a 90° angle. Accuracy is never a problem thanks to the visual and audible alarms that alert you when the rotary is beyond its leveling range and the locking compensator that protects the inner pendulum during transport. With an included laser detector, grade rod and tripod, this rotary laser system comes equipped with everything you need to get up and running.