Lab Grade pH Probe

Replace your pH probe or add another for another tank, calcium reactor, etc.

Buy this probe if you are
- Buying an Apex Lite (it does not include a pH probe).
- Replacing a worn out pH probe (we recommend you replace your pH probe every 18 months).
- Adding another tank to your system and purchased a PM1 to do so.
- Want to have a back-up probe on hand.