my Nexus rx strips give inconsistent results, if,for instance, I test the same fingertip drop of blood over three strips, I can get three different results, sometimes varying by as much as 1.5. So 1st. One say 7.1, next strip 6.8, and third , using same blood drop 6.1. As the strips are expensive I don't do this often, but as I considered 7.1 a bit high, I decided to retest and that's what I found. Any replies welcomed.