PH probe purchase and calibration for Desjoyaux PH systems: A guide.

Client:
Hello! I need a PH probe for a Desjoyaux PH system.

Thank you! Does it need any special calibration?
What else do I need for this?
PH7

Technical Advisor:
Hello
One moment
Here you can find the PH probe you need.
Yes, the PH probe needs to be calibrated.
You will need calibration solutions, do you know the values? ph7, ph4. It is stated in the manual.
Here is the PH7 buffer solution you need.