What are Survey Prisms:
Survey Prisms work in conjunction with an Automated Total Station. They are a specially designed retro reflector, specifically a corner reflector, that is used in the surveying and engineering fields to reflect the Electronic Distance Measurement (EDM) beam of a total station.
The survey prism reflects the EDM beam back to its source with both a wide angle of incidence and with high precision. Prisms reduce the scatter of the beam as it is reflected back to the total which allows for both a more accurate measurement and a longer range that the measurement can be made.