Digital thermometer and pointer thermometer which response to temperature real-time fast?

Pointer thermometer, is mainly refers to the mechanical principle of work of thermometer, bimetallic thermometer, for example. Common bimetallic thermometer working principle is to round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, called the free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial. Digital thermometer is the use of passive lithium battery power supply, internal measure the thermal resistance element, intuitive readings, response speed and is better than mechanical bimetal thermometer, but the battery according to using frequency, need to be replaced every year. Relative to the digital thermometer, bimetallic thermometer is more stable temperature measurement, the advantages of using the environment more widely. Such as industry, petroleum, chemical industry, heating system, piping, hot water boiler, heat preservation box. So is to choose the bimetallic thermometer and digital thermometer, or want to decide according to specific situation.