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Think its +/-5 ppb. @TRPlacek i use 2 phosphorus checkers and theyre usually always 3 ppb withen reach of eachother. Also the slightest bit of micro bubbles or undissolved reagent will usually alter the reading so this may be what you experiencedI can't remember what the margin of error is out of the box, but you might want to check that. Unfortunately the Hanna ulr is not a lab grade checker.