A medical sensor electrode includes an electrically conductive adhesive for establishing electrical contact with a mammalian body to enable the electrode to monitor physiological electrode potentials from the body. A first sensor element includes a flexible electrically conductive plate disposed on the conductive adhesive with the plate having substantial smaller dimension that the dimension of the conductive adhesive. A second sensor element includes an electrical conductive member disposed over the first sensor element and adhesive. The conductive member includes a non-conductive sheet coated with multiple layers of a metal and metal halide. A non-conductive backing is disposed over the second sensor element and conductive adhesive with the backing and the second sensor element having apertures for providing access to the first sensor element. A lead wire is connected to the first sensor element through the backing and the second sensor element and a non-conductive label is disposed over the backing apparatus and end of the lead wire.