Is my pH probe out of order

 If you have any questions, please let us know.

Hello, my Aqua isopool pH l3 brand Ph probe displays lower Ph levels than my manual measurement. She is 7. Wintered indoors.

Hello

should I replace it or do a calibration?

Start by calibrating

What type of kit do I need according to my equipment?

If the calibration works, for isipool you need the kit 4 7

4 7? What does it correspond to?

You can try another one if you don't have a solution. Soak the probe in water. Read the pH value and then add vinegar. The pH value should drop. If the pH value does not move then your is out of service

Kit for pH4 and pH7.

Thanks for the advice. I will test. And if things don't move, I'll get back to you. Regards.

Good luck.