You can get pH, ORP, Temp, O2
and I believe conductivity (salinity) from those like Apex & Profilux. They also control things like power heads, dosing pumps, return pumps & lights.
I know the Apex works as a redundancy unit as well, shutting off for example:
Return pump if water on floor
Dosing pump if pH climbs to high
Heater(s) if temp climbs too high
They can also automate things like PWC
if you so choose.
As far as Nitrates, Calcium etc, I believe those require titration measurements to determine the concentration, making it unfeasible. Even digital readers require you to titrate, but are able to read to a much higher sensitivity than we can see by comparing to a Colour card.