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Proprietary pH sensor technology and materials from Switzerland Durable reference system that improves the stability of the reference electrode and extends the life of the electrode PTFE connection point - a type of Teflon material with multiple pores that hardly get dirty The electrode has a BNC connector that is compatible with all pH meters that use BNC connectors, such as Aperas MP511, SX811, PH700, PH800, PC800, PH820 and PC820