Which tool is specifically used to measure horizontal angles?

The builder's level is specifically designed to measure horizontal angles with a high degree of accuracy. This instrument is essential for establishing level lines and ensuring that constructions maintain a proper horizontal plane. It utilizes a telescope that is mounted on a rotating horizontal base, allowing the user to sight and measure angles relative to the ground. By ensuring the level is calibrated correctly, builders can achieve precise measurements necessary for aligning structures, setting foundations, and other critical aspects of construction where accurate horizontal alignment is crucial.

In contrast, other tools mentioned serve different purposes. A laser level is great for projecting a level line over a distance but does not generally measure angles. A plumb bob is used to find vertical alignment, and a dump level is not a recognized term in construction measurement, often leading to confusion with tools used for leveling or grading.