I have the basic setup with four probes, I do not have the separate salinity module. I have watched some of the videos and read about calibrating the salinity. One thing I do not understand is this 2.2 offset that people talk about. I am not clear on when you use that? My method of calibrating the first time was floating the solution in the sump for a while, then put the temperature probe in the same container as the tank water, floating the solution bag right next to it with the salinity probe in the solution. In went through the automatic calibration, but I keep thinking should I had manually changed an offset? Can someone please clarify. When testing my temperature in the tank was 78.1