V.A. Zvezdina, S.V. Prokunin, I.V. Morozov Al’manac of Modern Metrology № 1 (6) 2016, pages 64–65 This work is devoted to metrological support of the pH scale using working standards of the 2nd category that are designed in compliance with GOST 8.120, for the verification and calibration of pH working standards of 3rd grade and … Continue reading Second-class working standards for pH. Features of use and ways of development