pH perfect Zodiac including the last calibration (new liner therefore new water

Hello, I have a Zodiac pH perfect whose last calibration (new liner therefore new water this year) gives me 50% reliability for the pH7 solution and 75% reliability for the pH4 solution.

Hello

Hello again, I am therefore considering changing the pH probe, but the one I see on your site does not look at all like the one that is in place (original). Can you tell me more

Try this little test: https: // probe-ph-redox- piscine.fr/content/16-ma- probe-ph-est-elle-hors- service-