The term "Rotary Level" refers to a surveying instrument used to establish a level reference point over a large area. It projects a rotating laser beam that creates a horizontal plane, allowing surveyors and construction professionals to measure elevations accurately. This tool is essential for tasks such as grading, landscaping, and building foundations. Rotary levels are often used in conjunction with a receiver, which detects the laser beam and indicates whether the surface is level. This technology is widely utilized in the fields of construction, land surveying, and civil engineering to ensure precision in various projects.