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This paper describes the possibilities, process and results of the electro-optical distance meters (EDM) of the universal measuring station (UMS) testing. A substantial part of this paper is devoted to the principles and procedures for checking and testing of electro-optical distance meters according to the international technical standards STN ISO 17 123-4:2013: Error! Reference source not found.. In the paper are defined the general requirements of the standards. Also is described a simplified and complete testi...