During an excavation project, what instrument is commonly used to measure angles?

The theodolite is a precision instrument used in surveying and construction for measuring angles in both horizontal and vertical planes. It consists of a rotating telescope mounted on a base that can be adjusted to measure angles accurately. In the context of an excavation project, using a theodolite allows workers to determine the layout of the site, ensuring that angles between features are correct and that the geometry of the excavation adheres to design specifications. The ability to measure angles precisely is crucial for maintaining proper alignments and achieving the intended outcomes of the project.

Laser levels are primarily used for establishing horizontal planes; plumb bobs assist in vertical alignment; and survey poles serve as markers for reference points rather than measuring angles directly. Each of these tools has its specific purpose in a project, but when it comes to measuring angles, the theodolite is the appropriate choice.