Have a magnet in the thermometer?

With the progress of the society, all walks of life will now use the thermometer, thermometer has been inseparable from the people's life and work, that has a magnet in the thermometer? Below the instrument to solve for you: common thermometer is no magnet, such as common bimetallic thermometer on the market, high pressure type thermometer, water meter is no magnet, only the surface thermometer is a magnet, so the surface thermometer thermometer is also called the magnet. Let's look at the surface thermometer! Surface thermometer is to rely on the principle of the double metal heat bilges cold shrink principle of sensors to work, by contact spring or magnet at the bottom of the thermometer to measure the metal surface and reading. This type of double metal surface thermometer can range from - 40 c to 500 c, the precision can be in for some using occasions for accuracy is not high, can yet be regarded as a money and cheap thermometer of beauty. Surface thermometer is used in pipelines, chemical equipment, used to measure the surface temperature, special thermometer is pipes.