Redox Calibration

Hi guys,
I have GHLP3ex model computer along with iks redox probe. According to the manual of GHL computer, the calibration shall be realized first by means of a null plug which I do not have it at all. Do I need a null plug in order to fulfill redox calibration? How can I calibrate my redox probe?
Thanks

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a null plug which I do not have

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It´s mandatory for calibration and normally part of the package. If you don´t have one, and can´t get one easily, an old probe can be used.
Cut the BNC connector with a short piece of cable, unmantle it and connect the inner wire and the screen together. Now you have a null plug.

you can also take a metal paper clip

Attachment 7937

Hi Guys,

Thanks for evething. I can understand.