Same, I have Hanna for Ca, Alk, and PO4, then Salifert for mag. If you want to bring water when you come over for the coral package, you are more than welcome to!
Sounds like we have water checkers all over the bay! It would be fun (for us data nerds) to correlate different test kits on the same sample and see where they stand. I have been tracking the delta between my trident and my hanna tests and it gives good information. In short, all of our tests are ballpark, and its trends we want to look for.