Casio solar powered calculators

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I really prefer using the solar powered calculators by Casio. I like the design, the units are in black, and very sleek. Plus, these have very big screens so I can better see the numbers. The keys are very big too, so my fingers don't spill out of the keys when I enter those numbers. These are not scientific calculators, so the functions are very limited, just the basic computations. But it is okay, these are the only things that I need at the store. Casio calculators are very affordable (I hate to say cheap) and because it is backed by solar power, the battery life stays like 2 years! These are very efficient calculators. We sell them at our store and we are currently using 5 of them for our store's computations. Very good buys! What about you? What are your calculators of choice?