Why use calculators battery operated while real solar calculators scientists are now available at very low prices?
Some calculators work only with solar energy and others have a battery that takes over in the absence of sufficient light.
Batteries used by calculators classics are often expensive and have a limited lifespan. A real clever stingy will rule this choice out quickly.
By using the free and inexhaustible solar energy, I save the batteries of course but in addition I do not spend more money on the purchase!
The cost of buying a solar calculator is equivalent to that of a conventional battery-powered model.
A smart purchase to save money at home, at school and at the office!
