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Red Sea Nitrate
I have the one that has both powder and liquid (it's a few years old,
though). The reading is temperature dependent. I've just ordered a few
Seachem kits to try (nitrate, phosphate, & iron) since they are on sale
at Drs. Foster Smith. I figured for 8.99 each, it couldn't hurt to try
I think my Red Sea kits are past their prime.
Which Red Sea nitrate kit are you using? They have one with a powdered
reagent and one that just uses liquid drops. The powder reagent test is
purportedly more accurate, but their instructions say to use the other
for ranges that are above 10ppm. This may give you a better idea if you
can't distinguish between the pink/red tones.