I use to use Seachem for Cal. I like it but it expires very quickly. I would probably try it again if i'm not convinced to try something else,,I like the Seachem kit for Cal.
the one mag test kit I tried was red sea and the results were VERY erratic. Followed procedures, cleaned vials, etc. 1550, 1340, 1520... back and forth... then I suspected the dropper for one of the liquids was defective and not consistent. When I contacted their customer service, they weren't helpful.
So I'm curious about a good mag test also....
I'm back to salifert for everything.
Spend the extra money and get a Hanna Checker.
Need recommendation on an easy to use and accurate Mag. and Cal. test kit. Thanks...