trying to find supplier for p h sensors? Just the bare sensor?

[fastline]

Seems most are in an assembly. Where can I source just the bare sensor? Is there something I am missing?

 

[Mosaic]

PH sensors are ionic sensors in a special glass envelope that permits Hydrogen ions to migrate thru it.
That also requires a chemical electrode, and thus a complete housing.
**broken link removed**

 

[fastline]

It was my understanding sensors would normally have the electrode and possibly a preamp built in?

As just a point of asking, is there any other methods to be considered to get even a less accurate ph measurement?

The reason I request a bare sensor is we must install it in a special protective housing.