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I've had some problems calibrating my ph meter and in searching forums it seems that others have had the same problem. I thought I would share what I have learned. A build up of minerals from hard water causes the probe to be so far out of calibration that it will not calibrate. Soak the probe...

Mine did the same thing. Here is what's happening. A build up of minerals from hard water causes the probe to be so far out of calibration that it will not calibrate. Soak the probe in PH down (acid) and lightly scrub it with a tooth brush. Try again to calibrate it. If you reset to the factory...