Why is the temperature of a thermometer the same as the temperature of the surroundings?

Why is the temperature of a thermometer the same as the temperature of the surroundings?
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Heat energy gets exchanged between the thermometer and thesurroundings. So, if you introduce the thermometer into a newsurrounding, it will initially NOT have the same temperature.However, since it's small and doesn't have a lot of mass, it willsoon lose or gain temperature, until it has the same temperature asits surroundings.
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