Toysmith 4 M Potato Clock # 4568 
- Be a scientist as you find out how to energy the electronic clock with potatoes
- Potatoes NOT involved
- A unique experimental kit that inspires young experts
- Turn the youngsters onto the idea of leaving a scaled-down carbon footprint
- No batteries needed
seven many years & up. The two Potato Clock enables you to generate adequate electricity to run a digital clock utilizing potatoes! Just push the zinc and copper electrodes into the potatoes creating an oxidation/reduction response that is converted to reduced voltage.
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$ 11.99 Price: best deal here
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