10 ppb accuracy
Hanna states the accuracy is 10 ppb, which is 0.01 ppm
http://hannachecker.com/manuals/Phosphorus.pdf
The unit is pretty cheap @ around $60.00, so I ordered one from goreef.com (a Canadian outfit, so you don't have to worry about customs brokers etc..)
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180 gal tank, 50 gal sump, PM RFCa6 Ca Reactor, SWC Extreme 250 1A Cone Skimmer, Tunz Osmolator ATOF, Aquacontroller Apex, Aquaillumination Sol Super Blue 6 x 75w Units, Acros/Softies/LPS/Mushrooms/Zoos, Purple/Powder Blue/Yellow Tang/3xBlue Chromis/2xTomato Clown/Lawnmower Blenny
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