Invention of a Thermometer.

A Clinical thermometer is an instrument used to record the body temperature of a human being.
The first known thermometer was invented in 1593 by Galileo, the famous Italian astronomer.
It was named a thermoscope.
But since it was not very accurate, alcohol thermometers were developed in 1641.
It was far more accurate.
The first mercury thermometer was developed by Gabriel Daniel Fahrenheit, a native of Danzig.
Mercury with its properties of a low freezing temperature (-38.8 degree C/37.8 degree F) and a very high boiling point (357 degree C/675 degree F) was an ideal liquid metal that could be contained in a tube.
The wide variation in temperature was ideally suited. In the Fahrenheit system of measuring temperature, the water freezes at 32 degrees F and boils at 212 degree F.
Thomas Albert just used the mercury thermometer to measure human temperature.