RE: water test kits?
Salifert is made in Holland. They are good kits. Pretty much the gold standard. I personally like the Seachem kits too. Pretty much the same, but more tests for the dollar.
If you are going to be running a reef tank, I would suggest adding Calcium, alkalinity, and magnesium kits to your collection. That's about all I test for on a routine basis. The exception is if I suspect there may be a problem or after some sort of system upset. I don't routinely test for pH anymore. From experience I know that if my alkalinity is where it needs to be, the pH will follow.
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano