Potentiometer is a typical tactile sensor type absolute Angle, there is a resistance in membrane (containing carbon resistance film, conductive plastic film, metal film, conductive ceramic membrane resistance etc.) on the sliding contact, by external effect, resistance to change in the position of contact point and membrane resistance ratio of up and down, to achieve the output voltage of change with the external position. Civil aspect, mainly for the automotive industry: the system of opening Angle sensor, seat position sensing etc., as well as the instrument industry: all kinds of recorder. , used in aerospace, navigation, military aspects of rockets and missiles, and automatic weapons systems.