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Neptune Lab grade ORP Probe

ORP Probe – Lab Grade Start monitoring ORP, replace your ORP probe or add one for another tank Buy this probe if you are: - You measure ORP in your aquarium with an Apex System or a PM1 module - replacing a worn out ORP probe (we recommend you replace your Lab Grade ORP probe every 18-24 months). - adding another tank to your system, want to measure ORP in it, 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