It’s a
device to measure an acceleration of a free falling object by gravity. It’s
easier to measure an acceleration of gravity with photogate timer system which
spots times of the object free falling from an arbitrary place. And you can
easily check on shifts of position of the free falling object.

Stand base(1) : Large, 4Kg

Square rod(1) : 1300mm

Electromagnet device(1) : 55 x 86 x 30 mm

Segye photogate timer

Accuracy: 0.01% of full range of the
measured time

Display: 2-line, 16-character, LCD

Inputs: Two 1/4" stereo phone jacks on
side panel - TTL compatible.

Resolution: 100μs

Time of pad(1) : Press-voltage sensor

Controller(1) : switch socket,
photogate socket, electromagnetic socket