The scale mainly works on the principle of force deformation of electronic strain elements. When an object is placed on the scale pan, pressure is applied to the sensor, and the sensor undergoes elastic deformation, thereby changing the impedance, and at the same time, the excitation voltage changes, outputting a changing analog signal. The signal is amplified by the amplifier circuit and output to the analog-to-digital converter, converted into a digital signal that is easy to process, and finally output to the CPU for calculation control, and the result is displayed on the display.