Mechanical scales use the principle of lever displacement to weigh the mass of the object being measured. It is an analog measurement, so the display value error is very large.

The electronic weighing instrument utilizes the principle of sensor measurement, which is to change the external pressure through the elastic beam of the sensor to make the resistance change of the strain gauge attached thereto. Under the action of the excitation voltage, the output is directly proportional to the measured object. Electrical signal to the AD circuit. The AD circuit of the electronic weighing instrument modulates, amplifies, filters, samples, integrates the analog signal sent from the sensor, and outputs a stable and efficient digital signal to the central microprocessor (CPU), and the internal working program is controlled by the CPU. The display circuit displays the weight value of the measured object. The selection of weights for electronic scale calibration is as follows:

1. One hundred thousandth of a balance chooses E2 non-magnetic stainless steel weight
2. One ten thousandth balance chooses E2 grade or F1 grade non-magnetic stainless steel weight
3. One thousandth balance chooses F1 grade non-magnetic stainless steel weight
4. One percent flat selection of F2 grade stainless steel weight
5. One tenth balance chooses M1 grade stainless steel weight or M1 grade cast iron weight
6.30kg-200T electronic scale selects M1 grade cast iron weight