Working principle of mechanical and electronic health scales
For mechanical health scales, the device works on the principle of using springs to determine weight. Simply place the object to be checked on the scale, thanks to the natural working principle of the spring, after a short time the device will give you the desired information. Because it uses a spring, the mechanical health scale does not have to use electrical energy.
https://chamnha.com/thuong-hie....u-can-suc-khoe-nao-t