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The AQUA30 is a flat-surface electrode designed for accurate pH measurements in the harshest environments and samples. The Orion AQUA30 process pH electrode is ideal for the harshest samples and environments. The HYDRAPERM Reference System is a polymer based reference electrolyte, which hydrates and expands when it comes in contact with an aqueous sample. These electrodes have a large, rugged reference junction, suitable for harsh process samples that fluctuate in temperature and pressure.