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#13
09-20-2011, 06:52 PM
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All I know is I bought a hanna checker and got 0.00 and tested 3 times. It was a while ago though.....and I know I must have some...but its low.
The hanna p04 checker is +/- .04ppm accuracy. Really not that good considering most people recommend PO4 to be less than .03ppm. 
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