Recently, Tsekouras et al. To separately investigate the anode and cathode of a 2-electrode capillary-fed cell during water electrolysis, it was necessary to introduce a reference electrode into the system. This was done by preparing a transparent, acrylic, second-generation test cell of the same type described previously, and then cutting off its bottom, as depicted in Figure . The transparency of the cell allowed for viewing inside during operation; however, little could be observed, requiring the need for the more advanced techniques reported here.