To study simple harmonic motion and periodic motion.

1. The device consists of a semicircular disc with a scale indicating degrees 0-180 degrees with a resolution of not less than 10 degrees.
2. Attach to the aluminum boss head. There is a screw on the back for attaching the test stand pole.
3. Weighted mass Can be tied with a rope, can adjust the length as needed
4. Compatible with Tripod Stand