Unlike other ear thermometers, Braun ThermoScan ExacTemp features a patented pre-warmed tip. It minimizes the cooling effect that could result from the insertion of a cool probe tip. The pre-warmed tip helps ensure accuracy time after time. A conventional tip at room temperature has a cooling effect on the ear canal. This cool-down effect can result in an inaccurate temperature reading shown on the display. A cooler temperature in the ear canal could also affect the accuracy of repeated measurements.