For corrosion and chemistry monitoring using electrochemical and potentiometric methods the selection of a suitable reference electrode is critical. Improper selection can lead to reduced confidence in the monitoring results and in some cases can render the obtained data invalid and unusable. While laboratory- and field-grade reference electrodes exist their use can sometimes be limited due to chemistry temperature and pressure conditions. In the present paper an evaluation of different materials for possible use as solid state pseudo reference electrodes will be presented.