Hello Steve,
Thank you for your interest in our products.
Based on the info provided, I would recommend the ProfiLux 4e.
This would give you a lower cost of entry without sacrificing expansion options. You can still expand and upgrade this controller at your own pace, much like the flagship ProfiLux 4.
We don't have issues with conductivity like the other guys.
If this is something you want right away, then the ProfiLux 4 controller would be the best option since it already has this port built-in.
If you think you may want it later, you can do the P4e to start, then get an expansion card that has the conductivity port and install it inside the P4e head unit.
The Kamoer dosers cannot be integrated with our system because we each use a different communication method.
If you wanted to control dosing through the ProfiLux, you can do it with the GHL Doser 2.1 Slave.
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