Hi there,
I'm having a slight problem with calibrating the ph probe. I have gone through it as described. To check if calibrated correct i check the probe in the solutions. In the 9ph solution its ok just moves up and down slightly. In the 7 solution it reads the same as the 9ph solution. It doesn't drop down to 7. If i put probe in tank it shoots up to 10.5 and stays there.
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