I'm having trouble calibrating my ph probe and need some help.
The ph in my tank has been a bit high and causing my apex alarm to go off, Everything was looking great and happy so wasn't too worried, tested alk and calc and was within acceptable tolerances.
I figured my ph probe had started reading incorrect and needed calibration.
I got 7 and 10ph caliberation packets. I've done it a few times and still seems to be off. I even timed it to sit in one packet for two min and then the other for two min.
PH shows 7.94 when I do a ph test kit shows ~8.2. The probe is about 2 years old.
Thoughts suggestions?