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A spring dynamometer is an instrument used to measure force. One common design uses the deformation of a spring to determine the magnitude of the applied force. The shape and stiffness of the spring are selected according to the application. The operation of the dynamometer is based on Hooke's Law, which states that the greater the applied force, the greater the spring’s deflection and corresponding scale reading. In practical use, the extension of the spring changes in response to the total suspended weight. The scale is calibrated in Newtons (N), the SI unit of force.
