Calcium Tests: RedSea vs Hanna Checker

[dmolavi]

Which do you guys use/prefer? I'm seeing some pretty wild variations test to test with my Hanna Checker (on the order of 75ppm difference between consecutive tests). Are the RedSea tests better/more accurate/more consistent?

 

[Sniperhank]

I found the red sea to be more confusing. If you are seeing wild swings in the hanna checker, it would be from some sort of human error.
The problem with calcium tests no matter who makes them is that the process to get that reading is more complicated than any of the other hobby grade tests. This is what gives us swings in readings, inconsistency, and frustrations.

 

[dmolavi]

I've put on my engineer hat and was able to get consecutive tests to within 6ppm...good enough for me.