Test Kits suck

[Delphinus]

I use Seachem tests for most things that I test (with the possible exception of pH). Two reasons I like them: 1) they come with a reference solution, so you can test your test kit against that. If it's close, great, if not, then you know either you're doing something wrong, or something is wrong with the test kit. 2) You can order test refills for some of them (I just restocked my NO3 test kit for example..)

I don't know if Seachem is any more accurate than others. They do tend to be more expensive. The Ca and Alk test kits were hella bucks. But, I've had them nearly two years and I still have tests left in them. I'm not sure if these ones have refills though I haven't seen any anywhere.

There is another brand that some people seem to like, but I can't remember the name exactly... SeaTest or something like that?

PS. I should mention that different test kits may have different strengths/weaknesses. For example, my NO3 test kit is awesome for low range NO3 levels, and just about useless for NO3 amounts above 15-20 ppm because the colour is just plain "freaking dark red" and although the chart goes up to 50ppm or 80 ppm or something (I can't remember offhand) I can't always tell the difference between "Dark dark red" and "dark dark dark red." Mind you the solutions are dilutable, mind you.