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Microcathode Clark-type electrode is supplied with PP membranes. Electrode jacket contains buffered KCl electrolyte solution. May be used in unstirred media if required. Membrane response time is 18 seconds for 90% of change. For fast responses (six seconds for 90% of change) use FEP membranes 53002-55 with electrode jacket 53002-58 sold separately at right.