A probe will last about a year and a half in saltwater, longer in freshwater(depending, IE if you have high levels of dissolved metals it could impact the electrode).
Best bet would be to let the probe sit in some PH4 calibration fluid (its basically acid, will dissolve any built up organics) for a few minutes then calibrate off of PH4 and PH7 fluids.
Single use packets of calibration fluid are $1 each, its worth spending $2 or $3 ($3 if you also get a PH10 packet) to calibrate. You could pickup a few extras of each and check it a month or two later to see if its drifting and needs replacement.
If you do replace the probe make sure to calibrate the new probe, probes are expensive compared to the cost of calibration fluid.
I have used the same probe for over 2 years and it's still working just fine. I have heard people say to replace them every year or so but at $50+ for a new probe I will wait until I notice it not working like it should. I think as long as you take care of them and store them properly when not in use they will last awhile.
they say replace every year hahaha
imo use until the calibration process shows drift
use ph 7 then ph4 then when you go back to ph 7 again, should be close
if the probe is shot it will fluctuate a bit and not want to settle into a constant readout
the one i have now is about two years , going strong
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