Who invented the Infrared Thermometer?

The infrared thermometer was developed from early infrared sensing technology created by physicist William Herschel, but the first practical non-contact infrared thermometers were invented and commercialized in the 1960s by engineers working in industrial IR measurement, most notably Exergen Corporation, which helped bring the technology into medical and industrial use.

You can find modern infrared thermometers from Enrgtech.