The article is devoted to the question analysis of the optimal choice of a portable spectrum analyzer in the conditions of functional tasks performance set before the Testing Center of the Ukrainian scientific and research Institute of special equipment and forensic expertise of the Security Service of Ukraine. The article considers the issue of additional equipment of the Testing Center of the ISEE SSU with modern measuring equipment for universal production of the world's leading manufacturers represented on the Ukrainian market. It is noted that the latest measuring equipment ensures the reliability and accuracy of measurements and tests. It is indicated that in order to improve the quality of tests by processing additional results obtained from devices with advanced functionality, it is necessary to further equip the t Testing Center of the Ukrainian scientific and research Institute of special equipment and forensic expertise of the Security Service of Ukraine with the latest technology. The authors note that among the main criteria for selecting a portable spectrum analyzer are «price / quality» and «universal purpose / highly specialized purpose». The article analyzes the features of the parameters of modern spectrum analyzers and possible ways to choose them for the needs of the Testing Center of the ISEE SSU, as well as proposals for their selection. It is noted that it is necessary to choose portable measuring equipment, which is recommended for field tests, but have characteristics similar to the parameters of laboratory instruments.