how much would the master test kits be and what would they include?
There are a couple of them.
Aquatest Set - 26.99
ph, kh, gh, nitrite
Aquatest Box - 74.99
ph, kh, gh, ammonia/ammonium, nitrate, nitrite, phosphate, iron, and either copper or chlorine (2 different sets)
Aquatest Box Marin - 74.99
ph, kh, ammonia/ammonium, nitrite, nitrate, phosphate, iron, copper, calcium