ORP Probe Calibration

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Hi All,

I have an ACII that needs the ORP probe calibrated.

I finally received some quinhydrone that I can mix with the pH7.0 and pH 4.0 solutions.

My questions are, how do I create a "saturated" solution? How much does it take if I use the prepackaged pouches of calibration solution? Do I keep adding the quinhydrone until it no longer goes into solution?

Thanks,
Ed