pretty much i use
Cal: Salifert
Alk/KH: Salifert
Phos: Hanna photometer...never found an really easy to read liquid kit...shades of blue always still had me guessing
Mag: Salifert
Nitrate: Salifert
Martini photometer(phosphates) cost less than a hanna and in my opinion and after several test against hanna more accurate but not by much and salifert for everything else..