Hayward offers their series of CATx000 commercial systems for monitoring pH and ORP. The probes used for these systems look just like the probes used in the residential sense & dispense system. A pair of replacement probes for the residential sense & dispense costs almost as much as an entire new sense & dispense system. I can get probes for the commercial CATx000 system for less than the price of the GLX probes for the sense & dispense.
You know what they say about a deal that seems too good to be true. So I have ask if there is there someone (in the business?) on the forum who can verify whether both systems use the same probes?