pH Electrode - Double Junction

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The Neptune Systems pH Electrode - Double Junction is an extra durable and accurate pH electrode. Replace your pH probe or add another for a different tank, calcium reactor, etc. I t is recommended to purchase this probe when buying an Apex Lite, as the Apex Lite does not include a pH probe. You can use this probe as a spare or to replace a worn pH probe. It is recommended to replace your pH probe every 18 months. Show more