a bioelectrical electrode is disclosed consisting of metal on its skin - side contact surface and having a conductive adhesive layer covering at least part of the skin - side contact surface . the conductive adhesive layer is formed as a layer of an aqueous dispersion adhesive that is pressure - sensitive and contains a substance that dissociates in aqueous solution . the preferred adhesive layer comprises an aqueous dispersion of a thermoplastic acrylic resin and gelatin . the preferred dissociating substance is mgcl 2 and the preferred metal contact surface is zinc . the adhesive layer may additionally contain citric acid .