First thing I think I'll post my basic parameters I was able to quickly grab before jumping into all the test kits.
Salinity: (I target 35ppt and slowly raising back to it after dropping to 34ppt)
34 ppt (slightly over) Via my Veegee/Vitalsine refractometer. I trust this the most. It's easy for me to read and has always been very consistent needing very rare calibration.
34.4ppt Via my Apex Salinity Probe. This I trust as a failsafe. It drifts a lot.
36ppt Via my Milwaukee digital. This always reads a rounded up 1ppt high even after calibration to 0 w/ ro/di
pH: (I target 7.9-8.4)
8.30 via Apex (I'm very upset to say my Hanna Handheld is broken I have to buy a new one. I've had it since 2009)
temp: (I use the Apex Seasonal Table so it varies)
77.0 via Apex
ORP: (I just find it interesting to track and compare it to events. I don't have a target)
386 via Apex