This upgrade expansion kit will convert a standard Profilux Plus II controller into a Profilux Plus II eXtended version, and likewise a Profilux 3 into a Profilux 3 eX, giving the following additions:
1 x Water level sensor port for use with an additional water level sensor or leakage sensor
1 x Saltwater conductivity sensor port
1 x Redox sensor port
1 x L5/L6 - 1-10v control port - for control of up to two (via splitter) LED simulation lights or channels for dimmable lighting or Tunze contollable stream pumps.
For instructions on how to upgrade your Profilux Plus II Controller see Here