A Mercury Glass Thermometer is a precision instrument used to measure body temperature, environmental temperature, or laboratory temperatures accurately. It consists of a sealed glass tube containing mercury, which expands and contracts uniformly with changes in temperature. The thermometer has a clearly marked scale (in Celsius or Fahrenheit) that allows easy reading of temperature levels.
Mercury glass thermometers are widely used in medical, laboratory, and industrial applications due to their accuracy and durability. They do not require external power and provide consistent readings over long periods.