This final paper explains, based on available literature, why the quality of electricity is important and how to check its quality. Since electricity is a commodity sold on the world market, it is determined by various standards, including standards on the quality of electricity. The second chapter describes the concept of electricity quality and the EN 50160 standard that refers to it. The third chapter contains a brief description of the characteristics of electricity quality, and most of this final paper is dedicated to this, and the fourth chapter describes the need for measuring electricity quality and certain methods. The fifth chapter describes the Fluke 435 power quality analyzer and how it is connected and used. It describes its capabilities, functions, how to connect to the network and some additional parts, and shows catalog data. The sixth chapter contains the results of measuring the quality of electricity in the FESB building. These results are presented graphically and it is clearly seen that the electricity in the FESB building meets the criteria set by the EN 50160 standard and on the basis of which the Fluke 435 analyzes electricity. The reason for this is that we had an unloaded consumer and were relatively close to the transformer station, so no significant fluctuations in the monitored electricity parameters were observed.