YES! He recommended I use the reagent kits as they're much more accurate.

They're not. They'll tlel you "low", "medium" or "wow that's high" but don't
count on accurary +/- 20 ppm.

The Hagen kit says "readings are affected by nitrite: but don't say how. And
I've seen it read absolute 0 at 80ppm (tapwater with enough KNO3 to make it
exaclty 80ppm).

Nobody who nows about this stuff trusts anyhting but the Hacher/LaMotte kit;
but then you really don't need to test for nitrates.


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