. If you have any questions, please let us know.

hello

Hello

Can I help you ?

On the CAT pr025 probes you should see the electrode, and on the ph 15 probe it is not visible, is this normal?

This is the original probe (with pH instead of ORP)

The one on the left in the picture is ours.

so on the ORP CAT PR025 the electrode is visible and the cat pr015 PH the electrode is like in a pROTECTION

Yes . Remove the bottle and screw on our probe instead of your current probe

these are two Harvard probes that I have

Yes, you have an ORP (RedOx and a pH

have they changed or is this normal

Yes that's right

so they are normal no need to change them

Yes, visually it looks normal. Now if you have measurement concerns you can do it's tests

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

https://ph-redox-pool.com/gb/content/16-ma-sonde-ph-est-elle-hors-service-

OK, thanks lot

as a general rule what the duration of these probes

For pH 2-3 years, for redox 4-5 years! This is indicative!

sometimes 8 years ....

thank you

You are welcome, do not hesitate to contact us! Have a good day