Thermofocus detects the infrared radiation naturally emitted by the body and, in particular, from the human forehead. In just a few hundredths of a second your Thermofocus takes a series of 125 readings, Its sophisticated microprocessor then amplifies and processes this information along with the room temperature, detected from a thermocouple probe incorporated within the sensor. The data are compared with the parameters contained in the memory, and the results of these processing is the temperature showed on the display.