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The Radiometer ISE25F-9 Fluoride Ion Selective Electrode (ISE) has a plastic body, a non-refillable internal electrolyte, and fluoride ion (F-) specific solid-state sensor. The ISE25F-9 is a half-cell ISE and requires an external reference. The Radiometer REF201 (article no. E21M009), REF251 (article no. E21M001), or REF451 (article no. E21M005) reference electrode is recommended. This ISE is a screw cap electrode and requires the CL114 cable (part no. A94L114) for compatibilty with Hach sensION+ benchtop meters (or any ion meter with a BNC connection).
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