pH Calibration Problems Solution: Is My Probe Defective?

Contact: Good afternoon

Agent: Hello

Contact: I have a question, the pH regulator reads 7 but doesn't change.
I have calibrated it and it shows as ok
But then I put the probe in different glasses of water with different pH levels and it doesn't change
It reads 7
Is it possible that the probe is faulty??

Agent: Yes, try this test: https://ph-redox-pool.com/gb/content/16-ma-sonde-ph-est-elle-hors-service-

Contact: I have done that test and it still reads 7, always 7

Agent: then the sensor is defective

Contact: Do you mean the probe??

Agent: Yes

Contact: The pH meter is Kripsol
Which one is compatible??

Agent: https://ph-redox-pool.com/gb/hayward/502-ph-probe-for-kripsol.html

Contact: Ok, thank you...

Agent: Good afternoon