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The Orion AQUA20 pH electrode has a rugged housing designed for accurate pH measruements in the harshest environments and samples. The AQUA20 is a double junction Ag/AgCl non-refillable pH electrode with automatic temperature compensation and solution ground. The AQUA20 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.