<p>The subject of this study is to explore modern methods for measuring the viscosity of liquid media, the state of its metrological support in the republic as well as to see findings from the experiments to ensure metrological control in the International System of Units (SI). The results from this study are found relevant for assessing quality and safety in agricultural and food products, biologically active additives, and wide use in metrology. It is also considered relevant in connection with the wide use of viscosity measuring tools in the oil- and fuel industry, medicine, cosmetology, geological and construction and other industries, to evaluate the quality and safety of products, control technological processes at production sites. Scientific and practical recommendations and decisions on the improvement of the scientific, technical, organizational and regulatory framework of the metrological provision of viscometers in the field of ensuring uniformity of measurements and its practical solutions. The findings from the study can be applied with metrological services, accredited state and legal entities in the field of ensuring uniformity of measurements. Based on the results of the research, metrological examination of various scientific, theoretical and functional viscometers, conclusions were developed.</p>