A thermometer is a device that measures temperature or a temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor (e.g. the bulb on a mercury-in-glass thermometer) in which some physical change occurs with temperature, plus some means of converting this physical change into a numerical value (e.g.
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Placing your hand lightly on your child's forehead often provides the first clue that there's a fever. Then you'll need a more reliable way to confirm your suspicion. That's when a good thermometer is necessary--meaning one that's highly accurate.
