Which device would you use to measure the temperature in a room?

Explanation

A thermometer is a device that measures temperature or temperature gradient. There are a few different kinds of scales in use across the world to measure temperature. The Celcius scale is abbreviated to the letter C and is used in most European countries. Fahrenheit is used in many Anglo-Saxon countries, including the US. A thermometer used to contain quicksilver, bi-metal or spirit, but today, the vast majority of thermometers are digital.