A swingarm hydrometer? YUK! Get rid of that and use a refractometer.

I have my lights turn off when it gets too hot. 2 turn off at 82 and the other 2 at 82.5

I wouldn't worry about ORP or Salinity that's just throwing money away (to me!) PH and Temp are the majors. I wish they could do CA Alk and Mg darn it.