An ideal way to calculate acceleration due to gravity.

This IEC ‘Free Fall Apparatus’ is adjustable at 1m and 1.5m. The cable from the solenoid is connected to the IEC timer (4064101), for the models that come with the timer, and the stainless steel ball is held by the solenoid at an exact height from the lower platform. The instant that the timing is started, the solenoid automatically drops the ball. When the ball strikes the lower platform, the timer is instantly stopped.

Instructions included.  Made in Australia.