Hi,
The Profilux 4e is a Profilux 4 with the same hardware except for the conductivity input and a Redox/pH port as well as 2 S-Ports:
"In comparison to ProfiLux 4, ProfiLux 4e has in the basic configuration one switchable pH/ORP input instead of two and no conductivity input, and in addition the less required S ports (digital outputs / connection for classicpowerbars) have been removed. Otherwise ProfiLux 4e is identical to ProfiLux 4."
Gaël
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