Filac's Advanced Sensing Technology (FAST) allows thermometer to target a precise temperature by searching for trends that are unique to a patient's individual body size. Unlike other quick predictive thermometers that are programmed to display temperature within a specified time frame, Fastemp will not produce a reading until it complies with both astm and cen standards. Yet results only take about 4 seconds for oral readings and 10 seconds for auxiliary and rectal measurements.