In the article, an equipment and practical application of an automatic system (created by the authors) for measuring the ferroelectric hysteresis loops using the Atmega328 microcontroller have been considered. The modern approaches to the classical Sawyer – Tower circuit's application was analyzed, and practical need for such development was proven. The schematic diagram and description of the main device’s components were given. Test results on measuring the hysteresis loops in a barium titanate single crystal were presented, and they were compared with the data published earlier. Moreover, the results on measuring the ferroelectric hysteresis loops of an -oriented 0.8Pb(Mb1/3Nb2/3)O3–0.2PbTiO3 single crystal in a temperature range of 120 –300 K at frequencies from 2 to 50 Hz were presented.