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For verification of Hooke's Law this set of 5 springs with different spring constants is extremely helpful!
The pre-stress has been removed to give accurate results. Compare the
elasticity of each spring as it stretches 2cm with a load of .05N, .1N, .2N,
.3N and .5N respectively. Just mount a rod to any stand and the springs easily
are held in place using a built in ring. At the other end of each spring is
a hook for attaching weight along with an easy-to-read adjustable position
Products being sold are not toys. They are for Educational / Laboratory use only. They are not for use by children 12 and under.