Casio SL-300SV Solar Powered Standard Function Calculator
This Casio unit has all of the typical functions of a basic calculator; addition, subtraction, multiplication, division, with memory, square root, percentage and the like. But the best selling point here is the ease of use for those with less than perfect eyesight. The LCD display is bigger than many standard calculators and the unit comes equipped with a large, easy to read keypad so you can push the right button with confidence. The calculator has an OFF button as well, so you can shut the unit down knowing you're conserving battery life, instead of waiting for it to power off on its own.