I've tried several varieties of test kits with mixed results. I absolutely love the hanna's. I'm still growing to get used to the Ca one, but the Alk and the PO4 are supreme!! I find that with the Calcium one, you need to be VERY precise with your measurements in order to get proper results. I've used the same methods for 3 tests in a row and got results form 305-520. I'm starting to get used to it though. I've got my lines down pat, and methods perfected... sort of. I'm starting to trust it more and more.
Alk and PO4... wicked!!
Magnesium... not released yet is it?
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