Body temperature is measured by pointing the Infrared thermometer IR 20e at the centre of the forehead. The correct distance is between 5 – 20 cm. There is no need to align the distance to read the correct temperature. Therefore it is easier and faster to use IR 20e as long as it stays within the specified range. Pull the trigger and within a split of a second, a beep is heard and the result is displayed and hold (frozen) for a few seconds before it turns off by itself.