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Show students the physical phenomenon known as the Doppler effect with this battery-driven apparatus. Swing the unit in a circular motion and your students will experience the effect firsthand. Comes with a 9-V battery (item #756318) already installed. The nylon cord, permanently attached for safety, is approximately 2-1/2 ft long. Includes instruction manual.
If for any reason you are not satisfied with this item, it is eligible for a return, exchange, refund, or credit up to 180 days from date of purchase. Restrictions may apply. Returns & Exchanges Policy.