Extremely tough thanks to the Stabila Protector system. Extremely simple operation. High-performance receiver for large working area of up to 2600 Ft. (800 m) in diameter. Deviations from the reference height can be read directly from the receiver display. Waterproof and dustproof (IP65). Includes: laser, receiver, hard carrying case, receiver bracket, 2AA batteries, 2D batteries, fixed head tripod, elevation grade rod and user manual.