Hydro Power Calculator

We’ve seen water-powered clocks, now here’s a water-powered basic calculator.  The Hydro Power Calculator from NeatoShop has three “batteries”.  You simply add tap water to these cells, and the metal-alloy electrodes produce electricity through a chemical reaction.  You’ll need to replace the water every 2-3 months.  The Hydro Power Calculator is $9.95.

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