Leveling instruments are tools used in construction and surveying to determine the relative heights of different points on the ground. They help ensure that structures are built level and that land is graded properly. Common types include theodolites, automatic levels, and laser levels, each serving specific purposes in measuring and aligning. These instruments work by establishing a horizontal plane, which serves as a reference point. Surveyors and builders use them to check elevations, set foundations, and create accurate layouts for projects. Proper use of leveling instruments is essential for achieving precision in various construction tasks.