Different types of thermometers include Surface magnet thermometer and bimetal thermometer . Bimetal or dial thermometer is inexpensive, durable, and recalibratable. A few are designed to be used in the ovens and some are not, however all the bimetal thermometer s work on the same fundamental technology of measuring temperature. Metal expands or contracts if heated or cooled. Different kinds of metals expand or contract with different rates. The sensors of Bimetal thermometer are produced of two diverse metals bonded collectively. When heated, this set will bend as one metal is increasing quicker than the other. A bimetal band can be cut in the coil shape, just like mainspring of the clock. With this shape, this coil may wind or unwind when the temperature has any changes. In case one end of the coil is seized so that this cannot move, its other end can be free for moving. The pointer is connected with the free end, as well as the temperature records on its dia...