Infrared: Precise fever measurement without contact Beurer FT80: What was before unthinkable with the usual fever thermometers is possible today thanks to the most advanced technologies: fever measurement, without contact. With the infrared technology, the fever is measured on the forehead, keeping the measurement device away from the forehead for several centimetres. The Beurer FT 80 fits well in the hand, detects the heat through a sensor and calculates the temperature value.