Some tools used to measure angles include protractors, transit levels, speed squares and bevel protractors. Protractors have a straight edge with ruler markings and a semicircular top that students use to measure angles by aligning the lines of triangles with the degrees marked on the circular edge.
Transit levels have a movable telescope mounted to a gauge that indicates degrees, minutes and seconds of angles. Surveyors use them to determine the angle of an object in relation to the curvature of the earth and determine grades or slopes of roads and building foundations. Speed squares are actually triangular tools with degree markings on one side that indicate the angles of beams and boards. Bevel protractors are protractors with adjustable arms that rotate to indicate the angle at which wood is cut. Carpenters use these tools to keep floors, walls and cup boards level.