Hanna Colorimeters

[bertoni]

It's nominally a bit better, but we don't know whether it performs up to spec.

[Randy Holmes-Farley]

Originally Posted by Buzz1329

Great thread.

Someone mentioned the Hanna Ultra Low Range Phosphorus Tester, which according to Amazon is "+/-5 ppb +/-5% of reading accuracy."

Is this more accurate/reliable than the Hanna Checker?

It is probably +/- 5 ppb phosphorus (which equals +/- 0.015 ppm phosphate), but in some places on their web site Hanna they have listed other values in the past.

In any case, that means that any readings within a 0.03 ppm range would be considered indistinguishable.

I've been wondering whether the silicate that I and some others dose might interfere at the very low end since it is a known interferent with that method, but Hanna's tech folks didn't know.

[yachtdr22]

Hanna has refunded my defunct Ca Checker.

I have a new reagent kit and the unused part of the original packaging if anyone is interested...