I have four meters--Freestyle Freedom Lite, Accu-Check Aviva, One Touch Ultra 2 & One Touch Ultra. Tested them against a lab test today. The Freestyle was closest to the lab results, with the One Touch Ultra 2 being second, but there was only a difference of two points between them. The Accu-Check Aviva was around 23 points higher than the other three & about 20 points higher than the lab results. I've always found the Accu-Check to be high, compared to the others, when I've used it to double-check any strange readings I've had.