The CONTOUR NEXT ONE ... Blood Glucose Monitoring System All-in-One Kit ... The CONTOUR NEXT ONE is shown to deliver remarkable accuracy(1) within ±8.4% of lab values*. The CONTOUR NEXT One blood glucose smart meter and app system combines remarkable accuracy(1) with ease-of-use to benefit a broad range of people living with diabetes. By integrating your blood glucose meter with a smartphone app you may simplify the management of your diabetes (3,4,5,6,7).