What is needed to .....

[Reefpro]

I want to run two complete systems off my Apex. I want to add another heater probe, ph probe and CaRX probe. What will I need to do this?

Thanks for any help

 

[Joeganja]

Apex pm1 module. Only has one port for pH or orp, one port for temp, and one port I/o, since you want two pH one for calcium also then you need two pm1

 

[Reefpro]

Apex pm1 module. Only has one port for pH or orp, one port for temp, and one port I/o, since you want two pH one for calcium also then you need two pm1

Thank you! That sounds right to me