UltraNFC Labels use an innovative temperature sensor that enables them to take a surface read of the object to which they are attached. This provides a closer approximation of actual product temperature versus the general ambient readings provided by bulkier recorders. Labels sample temperature every minute for highly accurate temperature reads and are encased in waterproof packaging. Further, each label is NIST traceable. Because of the unique physical characteristics of the sensor, labels do not require ongoing calibration to maintain accuracy. All labels are manufactured in ISO-9001 registered facilities.