I am working on ph monitoring now. The same code can be used for EC (salinity), ORP and probably DO as well. I personally wont test out those things, unless I see any value in them. As of now, I need only the ph support. ORP etc are not that useful in my understanding.
I see ec being useful as a backup to other ato sensors. Salinity drops to low ato off. If say you had an optical sensor as main on/off, float valve as back up, third failsafe would be the ec reading.
