Spring scale

A spring scale is a device used to measure force or weight. It operates on the principle of Hooke's Law, which states that the force exerted by a spring is directly proportional to its extension or compression. In a typical spring scale, a spring is fixed at one end, and as weight is added to the other end, the spring stretches. The amount of stretch is calibrated to correspond to a specific force or weight measurement, often displayed on a graduated scale.