4M – Green Science Potato Clock

4M – Green Science Potato Clock,Great Gizmos Kidz Labs – Green Science Potato Clock – What? No Batteries? Become a scientist as you discover how to power this digital clock using potatoes. Experiment to find out what other substances will power the clock – you’ll be amazed at the variety of results you find using household liquids and objects! Caution, this kit is high voltage inspiration and fun! Contains digital Clock with wires, pots, connecting wire, transparent tapes, copper and zinc strips and detailed instructions.