Choose from two types of reference fill solutions: 3.8 M KCl saturated with AgCl for AgCl/AgCl electrodes, or 4 M KCl for calomel (Hg/Hg22) electrodes. Both solutions come in a pack of two 125-mL — enough to fill approximately 25 electrodes.
Can be used for any double junction ph electrode & calomel.
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