This thermometer uses infrared technology to measure the surface temperature of the skin. The AIQURA Infrared Thermometer is FDA approved and has a range of -40 degrees to +280 degrees Fahrenheit. It is small and lightweight, with a laser pointer and a backlit LCD screen that shows the temperature in either Fahrenheit or Celsius. The AIQURA Infrared Thermometer is an affordable and accurate way to measure the surface temperature of the skin.