Brand Compatibility with PHREDO: A Dialogue with a Technical Advisor

Client:
Are they compatible with the PHREDO brand?
Thank you

Technical Advisor:
Hello, one moment, I'll give you the reference.

Technical Advisor:
For the PH: https://ph-redox-pool.com/gb/regul-electronique/80-sonde-ph-pour-phredo.html or https://ph-redox-pool.com/gb/regul-electronique/77-sonde-ph-pour-phredo-spe.html depending on the probe you currently have.
Do you also need the redox?

Client:
Not for now, if the pool technician can't fix the problem, I'll change the whole set.
Thank you

Technical Advisor:
What seems to be the issue?