Optical theodolites are precision surveying instruments used to measure horizontal and vertical angles between designated points. They're like the swiss army knives of angle measurement, essential for numerous tasks in:

• Land surveying: Mapping land boundaries, creating topographic maps, setting up construction sites.
• Civil engineering: Building roads, bridges, and other structures, ensuring accurate alignment and elevation.
• Mining and excavation: Determining volumes of earthworks, setting blasting angles.
• Astronomy: Tracking stars and planets,