Asking for no batteries or electricity, the Water Powered Calculator is all capable of doing the toughest calculations for you in a jiffy. Once you fill the water electric capsules with water, you don’t need to think of redoing it for the next two weeks. For optimum performance, add a small amount of salt to the water.
Two tubular power capsules contain two electrodes, copper and zinc, which undergo a chemical reaction that creates an electro potential difference to generate electric current for the calculator. A glossy piano black keyboard comes a thin aluminum frame around its edges. Available for $70 a pop, it’s never a huge ask for any eco-conscious purchaser.
