Client Inquiry: Upgrading to Procopi pH 220 Probe and pH 7 Solution - A Technical Advisor's Guidance

Client:
Hello, I would like to change my pH probe to Procopi pH 220. Ref probe ord 163330. QC PASSED. As well as pH 7 solution ref BSB 10800211.

Technical Advisor:
Hello, here are the links for the pH probe and pH 7:
pH probe
pH 7

Client:
Thank you for the information but the probe is a bit expensive, 110 euros.

Technical Advisor:
For this model, I don't think you will find anything cheaper.

Client:
My solution has expired for 3 years, should I change the solution or the whole set?

Technical Advisor:
If you have rinsed the probes before dipping them in the solution, there shouldn't be any problem.

Client:
No, I didn't do that, what should I do?

Technical Advisor:
In that case, it would be better to change the solution.

Client:
I will first order the solution and if the result is the same, I will order the probe.

Technical Advisor:
I advise you to test your probe like this:
Test the probe

Client:
Okay, I will do that. Otherwise, I will order the probe. Thank you very much.