Hmmm, My problem is the Mil who has type 1, and for some reason does not test because she says; she does not need too due to the insulin she takes? gave me the Contour and said she would get strips off Doctor for me, but her old doctor has retired and the new one has told her she is only getting one pot a month, I am testing 4 times a day after meals and before bed. so need about 124 strips a month, I have bought the Codefree because as we all know the strips are massively cheaper. But the disparity from the other two which do read roughly the same, seems to be around the 15% mark for what my BG normally runs at, in the 4.6-5.5 range. I know using different mater will send you bonkers and don't do it for that reason but did need to find a bench mark.Think I will just adjust my excel sheet to knock the 15% off entered readings. That way there will not be a big jump from my Contour readings.