<a href=showthread.php?s=&postid=10243631#post10243631 target=_blank>Originally posted</a> by old salty
It's rather difficult to say one test kit is accurate over another. The cost of proper laboratory testing is far beyond what any hobbyist is willing to pay. I have access to this equipment, but it requires time (money) to set the tests up properly.
Since nobody can back up any claims of accuracy of test kits, the next best thing would be repeatable results. This does nothing for accuracy, just ensures that the results of back to back tests are close to each other. For this very reason, test kits should be used more as indicators than for absolute numbers.
I have had success with Lamotte, Elos, Salifert, and even Tetra (for FW) with regards to repeatable results.