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Neptune Lab Grade pH probe

pH Probe – Lab Grade Replace your pH probe or add another for another tank, calcium reactor, etc. Buy this probe if you are: - buying an Apex Lite (it does not include a pH probe) - replacing a worn out pH probe (we recommend you replace your pH probe every 18 months). - adding another tank to your system and purchased a PM1 to do so. - want to have a back-up probe on hand Lab Grade Probes tend to last longer, give more accurate results, stay calibrated longer, and need replaced less frequently