I have a Bayer Contour Next USB and the SD Codefree and I have to say that the Codefree has been fairly consistent with the readings from the Contour, although it can sometimes give an erratic reading (as can all meters). The Codefree is certainly good enough for observing trends and working out how certain foods affect you, but for 'important' measurements, the Contour Next probably more reliable. More expensive to run though :-(
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