Q. How does the jewellery weighing machine work?

Answer

An electronic digital Jewllery weighing scale is a tool for this purpose. A strain gauge load cell is used to make this mechanism functional. The weight on an analog scale is displayed by tension in the springs, while the weight on a digital scale is translated into an electric signal. The fact that a wire's electrical resistance will fluctuate depending on the amount of force applied to it. Four strain gauges typically form a Wheatstone bridge in a load cell. As a whole, the output from 4 strain gauges is visible, and it's on the order of a few millivolts. The setup makes it appear as though the object on the platform exerts force on the one below it.