I kinda hate the master kit.... its like a bottle neck for me. they have 2 ph reagents, 2 amonia reagents.... your not even going to use that much.
I like the Professional but its like 60 bucks lol.
well for me (cycled tank required) PH, GH, KH is all you need. Well you don't even need GH KH kit if you really really really trusted your RO unit/ source.