Determining if a pH probe needs to be replaced

[Galizio]

When I talked with a Neptune rep, he told me a regular ph probe should be replaced every year, a bit longer with a lab grade one.
I been using the same probe for 3+ year and only had to recalibrate a couple of time


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[Bryan]

Usually a good sign of a probe that is low quality or needs replacing is how fast it reacts to pH changes. If you stick it in a calibration fluid and it takes forever to stabilize it's probably past it's best before date. Although that doesn't necessarily mean it is inaccurate once calibrated.