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Message: <blockquote data-quote="Oldvatr" data-source="post: 1062197" data-attributes="member: 196898">I have not seen a single posting in this forum where someone has reported the SD Codefree reading lower.  Not one, though I stand to be corrected.  The problem with the ISO requirement is that the meter has to be designed to meet the requirement.  Once this has been verified, then it is licenced, and  there is no further requirement for the production line to validate each meter.  A meter manufacturer only has to demonstrate that the design CAN meet ISO, not that every meter DOES.  This is maybe why the calibration fluids are so wishy washy.  they only need to detect faulty meters that are grossly malfunctioning.I have noted that my SD and my NEO have differed by more than 30% of reading, but not the 40% that the okder ISO standard required.  Since the new iSO (i.e. 15%) is not yet in place, then i have to say that my meters are reading correctly and that neither is faulty.  This is why i cannot get mine replaced.I try to use trends to base my decisions on, and use averages wherever I can.  The one area I cannot do this is when checking for hypo and safety to drive or operate machinery.   i use 2 meters, and take the lower reading for this check, and the other meter then provides a sanity check.</blockquote>

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