GOST 8.135-1974 State system for ensuring the uniformity of measurements. pH measuring. Standard-titres material dose for making 2nd class standard buffer solutions. Specifications
2004GOST 8.135-2004 State system for ensuring the uniformity of measurements. Weight amouhts of the standard materials for preparation of the buffer solutions - operational pH standards of 2-nd and 3-rd classes. The technical and the metrological characteristics. Methods of
1974GOST 8.135-1974 State system for ensuring the uniformity of measurements. pH measuring. Standard-titres material dose for making 2nd class standard buffer solutions. Specifications