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Client :
Hello, after calibrating my pH probe, it shows up as rC on the display
Technical Advisor :
Hello, test your probe like this
https://ph-redox-pool.com/gb/content/16-ma-sonde-ph-est-elle-hors-service-
It's probably the probe
Client :
I rinsed the probe with water, then dipped it in the pH 7 solution, pressed the cal button, and 1 minute later I rinsed the probe and the pH is at 5.1
Technical Advisor :
That doesn't seem good, but do the test like that and you'll know
But usually rC means the probe is out of service
