Expression of performance of electrochemical analyzers - Part 2: pH-value (IEC 60746-2:2003 + Corrigendum 2003); German version EN 60746-2:2003— 23 стр.
Water quality - Determination of alkalinity - Part 1: Determination of total and composite alkalinity (ISO 9963-1:1994); German version EN ISO 9963-1:1995— 13 стр.
Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity (ISO 9963-2:1994); German version EN ISO 9963-2:1995— 13 стр.