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Thermometer is a device which is used to measure the temperature of a body.
Thermometer is an instrument used to measure temperature.
Thermometers are used to see if you have a fever or tell you how cold it is outside. Made up of thermo (heat) and meter (measuring device), the meaning of the word thermometer is pretty straightforward. Thermometers measure temperatures in degrees, according to either the Celsius or Fahrenheit system.