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Thank you for the conversion chart, this is a very good verification for me!
I used to have the 774, which measures Phosphate in ppm and never detected *anything*. I thought it was broken, so diluted some TSP and measured that--yup, the 774 works; I was just too low. When I bought the 736, which measures Phosphorus in ppb I was able to see what's going on.
The (rough) conversion I use to get from ppb of P to ppm of PO4 is move the decimal 3 places to the left, then multiply by 3; that seems to sorta match the real numbers you provided.
I think your confusing the 774 which is a brand new version that is ULR with the 713...