Spring Balance Flat Form / Round Clear Tube Type 1N / 2.5N / 5N / 10N / 20N / 50N / 100N

The spring balance (also known as spring scale) is simply a spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.