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[APD] PH calibration/cleaning

Please post what reading you get with your PH probe for 5% acetic acid. I got 2.9 uncalibrated and 2.5 calibrated when the calibration corrected for .1 PH in the normal range of 6-7. It would seem it is more sensitive/less accurate towards the extremes.

Also, what solution is normally used for cleaning? The above?

- Chris.

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