Reference electrode
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A reference electrode is also referred to as the third electrode in a three electrode electrochemical system which has a stable, known and well-defined electrochemical potential. Reference electrodes in often used in cathodic protection systems in order to measure the potentials of the protective object. A reference electrode, no matter the variant, should provide a stable potential for controlled regulation of the working electrode potential and allows the measurement of the potential at the working electrode without passing current through it.