Theodolite – Theodolite is a most accurate instrument used for measuring horizontal and vertical angle. What are the USES OF THEODOLITE ? Used For measure the Horizontal angle and Vertical angle. To measure Deflection angles and Magnetic Bearing. For Astronomical Observation. To fix Alignment of building Boundaries, Etc. . . To fix Alignment of Rail, Road, Electric poles, Telep... https://perfectcivil.com/uses-of-theodolite/