Solution to Calibration and Malfunction Problems in pH Electrodes for Swimming Pools

Customer:
Good afternoon, I have a pool pH electrode and my calibration solutions have expired for two years.
Are these liquids valid for calibrating that probe?
The electrode is 3 years old, could it be damaged? Or is it enough to use the liquids alone?
Thank you very much Olivier.
In case it is damaged, I have an AstralPool Control Basic Evo 1.5 Lt equipment.
Do you have the probe and liquids for that model?
Thank you very much.
Does it come with the calibration solutions or do I need to buy them separately?
Thank you very much Olivier.

Technical Advisor:
Hello.
Yes.
Yes, try it like this.
5 minutes.
https://ph-redox-pool.com/gb/astralpool/3199-ph-probes-for-pool-basic-astralpool.html
No, I want the PH4-PH7 solutions.
https://ph-redox-pool.com/gb/pool-buffer-calibration-solution/1640-ph4-ph7-calibration-kit.html
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