S: (n) alidade, alidad (surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles)
S: (n) alidade, alidad (surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments)
S: (n) clinometer, inclinometer (an instrument used by surveyors in order to measure an angle of inclination or elevation)
S: (n) plane table (surveying instrument consisting of a drawing board and a ruler that are mounted on a tripod; used to sight and map topographical details)
S: (n) range pole, ranging pole, flagpole (surveying instrument consisting of a straight rod painted in bands of alternate red and white each one foot wide; used for sightings by surveyors)
S: (n) surveyor's level (surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land)
S: (n) theodolite, transit (a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod)