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This AC spark recording timer is used to measure velocity and acceleration of falling or moving objects in dynamics studies. It produces sparks at uniform time intervals which are marked on a paper tape. The distance between the marks is used to calculate velocity and acceleration. It comes with 120' of recording paper tape, 5 carbon discs, a table clamp, and a 300g weight. Uses standard AC 110-volt power. Includes a study guide with instructions and experiments.