I want to say I love the ease of use, and certainty that Hanna Checkers give me as a reef keeper. When troubleshooting chemistry issues, or trying to trace down the cause of something, having a quick, simple and repeatable test, that gives me a precise reading I can trust is important.
Having to second guess "Did I do it right?" or "is that this shade of blue? or that other slightly different shade of blue?" to determine if it's 0.25ppm or 0.50ppm is crazy...
Absolutely love the Phosphate checker I have now, and I'd love to replace ALL my tests with them at this point.
But the one I think that I'd like the most right now, is the Alkalinity tester, as I'm trying to troubleshoot Alk/PH balance right now, and the current tests are both complex, and hard to read.
Great giveaway! And these would get me a long way towards replacing all my tests with Checkers!
Bonus entries to follow!