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The paper reveals proposed techniques and measurement results obtained by employing Leica AT401 laser tracker into processes of calibration of field length geodetic baselines. Firstly, testing of the available laser tracker in Research Institute of Geodesy, Topography and Cartography (RIGTC) is shortly introduced and the development of a user-programmed software ATControl is presented. Secondly, measurement methodologies used for calibrating Czech State Long Distances Meausuring Standard KoпїЅtice and National Geo...