This water powered calculator requires no batteries and no electricity just pour some water into the rear power pack, insert the stopper panel and the electrolytes in the water will generate all the power needed to function. Unlike conventional solar powered calculators this water powered calculator can be used in all light conditions (no more fading displays at that critical moment) and with 2.5 billion batteries wasted each year this is a great gift for the environment, and anyone doing serious math.
Via: BitsAndPieces
