Why Forehead Infrared Thermometers Are Misleading in Extreme Temperatures?

https://machinesense.com/pages/infrared-thermometer-opx-by-feverwarn

While an infrared thermometer can measure skin temperature accurately, the real question is: does forehead temperature tell us anything about core body temperature, the true sign of fever? The answer is NO. Check our infographic to see how OPX technology in FeverWarn thermometers can scan for accurate core body temperature in all weather conditions.