Diagnosing and Replacing a Faulty Redox Probe for Chlorine

Client:
Hello, I have a chlorine redox probe that displays "HS" after calibration. The chlorine test strip shows no chlorine.

Technical Advisor:
Hello, I think the probe is out of service. Try this small test.

Technical Advisor:
https://ph-redox-pool.com/gb/content/17-is-my-redox-probe-out-of-order

Client:
OK, I will do the test. If it's out of service, which probe should I buy? Because in your list, there are only pH probes.

Technical Advisor:
What controller do you have?

Client:
https://files.smartsuppcdn.com/files/accounts/409828/uploads/APmQ1qCfB_thumb400.jpg

Technical Advisor:
One moment.

Technical Advisor:
https://ph-redox-pool.com/gb/hydro-sud/394-ORP-Probe-for-Régul-pH-+-Redox---LABEL-HYDRO-SUD.html

Client:
Is it the same probe for pH and chlorine?

Technical Advisor:
No.

Technical Advisor:
For pH: https://ph-redox-pool.com/gb/hydro-sud/324-pH-Probe-for-Régul-pH-+-Redox---LABEL-HYDRO-SUD.html