<a href=showthread.php?s=&postid=15688607#post15688607 target=_blank>Originally posted</a> by JCR's Reef
I never did compare it to elos or any of the more expensive ones b/c I've never used them. If I remember correctly TM tests for Mg and Ca in the same test.
The only area's I test for now alk, ca, mg and PO4 and that in my little 40g. I havent tested my water in over a year in my 110g because I only have soft coral in there.
I use API and I.O. for ALK and compare the 2 together. They are always pretty close.
For CA I use API. I'm not getting the high reading unless I do my monthly water change and thats b/c I use RC which is higher in CA. I shoot for the 440 mark in my tank but when I change the water its up to about 480-500. I use the salifert for MG but who's to say its accurate as I dont have anything to compare it to. I use a hanna LR digital readout for phosphates.
The only RedSea product I would recommend is the copper test kit.
I'm in the same boat as you as far as test kits go. Im wanting to know which ones are good and not wanting to buy them just because they are expensive. You get what you pay for doesnt always hold true.