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for now I would take an average of the 3 as reading. .02 and .08 are not that off i think that is a good range.. lets see what happens when you get the calibration fluid....I also have a NYOS Phosphate test kit to compare against the Hanna H1773 and the H1774. Today readings results. H1717 read 0.00 H1774 read 0.08 NYOS read 0.02 Which one is accurate?