I decided to check my pH with a Hagen colorimetric kit I had on hand, it read 8.3 (ish), where it should be. However, I am not really trusting the colorimetric test either as it is a year old and well..it's made by Hagen.
So, I am wondering if anyone has had issues with the pinpoint pH monitor/probe, could it be the calibration liquid, or malfunctioning monitor/probe? I used to use a pinpoint temp monitor but but stopped using it when I discovered it was out of calibration by 0.5 F (no way to calibrate it).
I guess I am off to the LFS to buy another pH kit, maybe Elos for a third opinion. I would be interested to know however, if anyone has had problems with this unit and calibration or any other thoughts.