Welcome!
I use Hanna for dKH and phos. I bought a pocket Icecap salinity checker and a similar pH checker. If you’re using a monitoring system/controller that’s obviously completely unnecessary. I use salifert kits for calcium and magnesium.
One note on the hanna checkers I learned the hard way. Once you open the liquid reagents they’re only good for 30 days. I was using expired reagents, wondering why my alkalinity was always low. I even started dosing sodium bicarbonate to raise it only to read a thread about the 30 day thing. I still like Hanna but for already expensive checkers this seems like a money making thing and was super frustrating. Granted, I caught it in time so had no I’ll effects but figured I would share to hopefully spare somebody else.
