During the 1985 excavation season of the Mycenaean citadel of Midea in Greece, a survey was carried out using electronic distance measuring equipment based on the principles of a reflected infra red beam. The equipment was used to measure the extension and elevation of the cyclopean-built encircling wall and, during excavations, to measure small finds, architectural remains, and strata. Thia method was faster and more accurate compared with traditional methods. Comparison between electronic transits and traditional optic transits were also undertaken.