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In Annex IV to Directive 2011/65/EU the following point 37 is added:
wide-range measurements with a conductivity range covering more than 1 order of magnitude (e.g. range between 0,1 mS/m and 5 mS/m) in laboratory applications for unknown concentrations;
measurements of solutions where an accuracy of +/– 1 % of the sample range and where high corrosion resistance of the electrode are required for any of the following:
solutions with an acidity < pH 1;
solutions with an alkalinity > pH 13;
corrosive solutions containing halogen gas;
measurements of conductivities above 100 mS/m that must be performed with portable instruments.
Expires on 31 December 2018.’