S.F. Nekrich Al’manac of Modern Metrology № 1 (17) 2019, pages 63–71 The article provides information on the development of the hydroacoustic standard in VNIIFTRI and its metrological characteristics. The results of comparisons and prospects for the further development of the standard are discussed. Key words: hydroacoustic standard, metrological characteristics, comparisons, prospects. Full texts of articles … Continue reading Improvement of hydroacoustic standard GET 55-2017