Live Temp Pro Infrared thermometers work based on a phenomenon called black body radiation. Anything at a temperature above absolute zero has molecules inside of it moving around. The higher the temperature, the faster the molecules move. As they move, the molecules emit infrared radiation — a type of electromagnetic radiation below the visible spectrum of light. As they get hotter, they emit more infrared, and even start to emit visible light. That is why heated metal can glow red or even white. Infrared thermometers detect and measure this radiation. Click here https-www-marketwatch.com/press-release/live-temp-pro-infrared-thermometer-able-to-detect-fever-without-contact-report-2020-2020-04-25