DIN 55659-2
DIN 55659-2 Paints and varnishes - Determination of pH value - Part 2: pH-electrodes with ISFET technology
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2012
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2012