When Was Infrared Thermometer Invented?

The history of infrared thermometers is a relatively short one. Radiation was not discovered until the start of the 19th century and not named infrared until the late 1800s. The first radiation thermometer patent was granted in 1901, and the first commercially available model was introduced in 1931.

How accurate are infrared thermometers?

To make things worse, infrared thermometers have an accuracy of ±3 degrees. That means your recorded temperature could potentially indicate hypothermia or fever, even if your body temperature is actually normal.

How did they measure temperature in the 1800's?

1800s. 1866 — Thomas Clifford Allbutt invented a clinical thermometer that produced a body temperature reading in five minutes as opposed to twenty.