Now there is nothing cooler than thermometers, now this on is not that old I know but it is cool and it is metal not plastic. and it's hanging in my shop and still accurateDeveloped during the 16th and 17th centuries, a thermometer (from the Greek θερμός (thermo) meaning "warm" and meter, "to measure") is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor (e.g. the bulb on a mercury thermometer) in which some physical change occurs with temperature, plus some means of converting this physical change into a numerical value (e.g. the scale on a mercury thermometer).
