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The sensitivity parameter is one of the most important parameters characterizing UHF RFID tags. This paper presents methods for measuring this parameter. It focuses on the use of non-expensive laboratory equipment. Nevertheless, the proposed methods provide accurate results. Losses and behavior of the setup are calculated and described in detail. Single-ended and differential structures are distinguished and handled separately. Since the antenna plays an important role, its behavior is also considered. Still, the measurement setup is contact based.