During the 1985 excavation season of the Mycenaean citadel of Midea in Greece, the author carried out a survey using electronic distance measuring equipment (Wild Heerbruggs TI 6 and DI 4 with a keyboard) 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 (440 m long and up to 7 m wide) and, during the excavations, to measure small finds, architectural remains, and strata. This method made all measuring procedures easier, faster, and more accurate compared with traditional methods. Comparisons between electronic transits and traditional optical transits were also undertaken.