An electronic weighing scale belongs to, the use of Hooke's law or the force of the lever balance principle to measure quality tools. Electronic scale is mainly composed of a load-bearing system, such as pans, scale and force transfer conversion system (such as lever force transmission system, sensor) and value system, such as dial, the electronic display instrument, three parts composition. According to the principle of structure can be divided into mechanical scales, electronic scales, mechanical and electrical balance of the three categories.