The oldest evidence of the existence of scales is dated from 2400 to 1800 BC in the Indus Valley (in present-day Pakistan). Before this, there was no standard and precision with which weight could be measured. In Egypt, scales date back to about 1878 BC, but their use probably extends much earlier. The scale in the true modern sense was improved and invented by Leonardo da Vinci.

JW-202 High Precision Round Household Glass Kitchen Scale

By the 1940s various electronics were attached to these designs to make readings more accurate. None of these are true scales, and the actual measured weight still relies on load cells, small nodes where pressure is converted to a digital signal. Only recently did the electronic scales in the true sense appear.

effect:

The function of the scale is mainly manifested in its essential use. It can accurately measure the weight of the human body and reflect the weight control of a certain period of time through the daily weight change. Weight control is the basis of health management. Therefore, modern It is best for each family to have a scale to grasp the weight of the whole family, which is a very important item to ensure the health of the whole family.