The general purpose of these designs are described in “Polyaniline Electrodeposition on Flexible ITO Substrates and the Effect of Curved Electrochemical Conditions”, which is published in the Journal of the Electrochemical Society (open access). DOI: 10.1149/2.0871913jes Journal of The Electrochemical Society, 166 (13) D1-D3 (2019) This particular part is an electrochemical cell used with a any planar electrode, though here we have used it for ITO electrodes. We recommend placing the counter electrode in the compartment furthest from the working electrode, and the reference electrode closer to the working electrode.