Reef Angel Forum

I have a PH probe and salinity probe that I've had for over a year at least. I was wondering how long there good for, do they need to be replaced after a certain amount of time? I tried calibrating the PH probe but it still doesn't seem to be reading right. Haven't messed with salinity probe but it's reading low also.

Ph probes don't last forever. I've seen 6months to 2 years. I've seen much better duration with the lab grade ones.