The AQ400 Series (manufactured between 1992 and 1996 used a Myron-L brand resistivity controller. If you purchased this machine from Aqueous Technologies you would have received a Myron-L manual which describes the calibration procedure in detail. Contact Aqueous Technologies at +1-909-944-7771 and request a copy of the Myron-L manual. If you did not purchase the machine from Aqueous Technologies, you will need to register the machine (free of charge).
For a more detailed reply, please contact me directly at konrad@aqueoustech.com
I hope this helps.
Mike Konrad
Aqueous Technologies
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