Here is the heavy-duty steel helical spring and weight set you need for large-scale classroom demonstrations. Use a meter stick and clothespins as markers to measure the spring extensions in your experiments. The spring is over 20 cm long. Comes with one 1000-gram weight with single hook, one 500-gram weight with double hook, and one 200-gram weight with double hook.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 622