Some setups do not tolerate platinum, due to chloride evolution, gold contamination concerns or simply budget. This page covers non-Pt counter electrodes: gold wire auxiliary electrodes in glass bodies, silver counter electrodes, rhodium-plated mesh and foam counters (nine model variants), mixed metal oxide (MMO) ruthenium-iridium coated titanium mesh, glassy carbon rod counters and stainless-steel wire and mesh auxiliary electrodes for high-pressure and corrosion work. Useful when the counter material itself matters or when cell geometry demands a custom shape.