Smallblock;686422 wrote: Elos, Amoninia, nitrate, nitrite, PH, Phosphate, Magnesium, Calcium, Alkalinity
I think thats about it, I may be leaving one out
Edit: you also should pick up a refractometer to measure Salinity. Also a good thermometer. I use a digital one that measures meat when you cook it. You can find them in the grilling section at lowes/HD