2012DIN EN ISO 10523:2012-04 Water quality - Determination of pH (ISO 10523:2008); German version EN ISO 10523:2012
2012DIN EN ISO 10523:2012 Water quality - Determination of pH (ISO 10523:2008); German version EN ISO 10523:2012
0000 DIN EN ISO 10523:2011
0000 DIN 38404-5:2009
1984DIN 38404-5:1984 German standard methods for examination of water, waste water and sludge; physical and physico-chemical characteristics (group C); determination of pH value (C5)