Ok, actually that ended up being really simple...however, I didn't really continue reading beyond that part where he goes into the math of it. Thanks for the correction guys! It looks like I am right around the accuracy level of the checker, so I still just have a tiny "sniff", but at least I have something!
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Originally Posted by Randy Holmes-Farley
Both checkers check only the inorganic phosphate in the tank. Despite the name, the phosphorus checker does not actually detect phosphorus. The name, and the units it reads in, is just a marketing distinction.
The Hi736 Phosphorus checker does have a somewhat better accuracy, so that would be the one to pick for most reef applications.
You do need to multiply the reading by 0.0032 to get ppm phosphate. So 5 ppb = 0.016 ppm.
Note to that the values have a stated uncertainty of 5 ppb phosphorus (0.016 ppm phosphate), so 000 ppb could really be any value up to 0.016 ppm phosphate.
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