Just an FYI...when I had big problems with my pH (it went down to 7.5) it turned out to be my probe. I cleaned the probe by soaking in a 2 part cleaner for 2 days, then recalibrated it. Now it was dead on. I put it in my tank and it was 8.3. I then watched over the next 12 hours as it dropped back to 7.5. I recalibrated and tried again. Started at 8.3....ended at 8.9!!
What I would do it buy a cheep hagen pH kit and match it against your probe. Just for peace of mind.
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Brad
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