Texas Instruments TI503SV Handheld Pocket Calculator
The TI503SV performs all of the necessary mathematical functions including square root, percentage, and plus/minus for negative entries. You also get three memory buttons as well, just like you'd find on any standard calculator. But what puts this on our list is the curved, ergonomic aesthetic, making it easy to grip even with small hands. The buttons are also unique, each one shield-shaped and comfortable to push. The LCD display is seven millimeters in height, so the numbers are large and easy to distinguish. Some may find the numbers on the keypad a little less so, as the keys are small and the font slender instead of thick. The calculator does not come with dual solar and battery power, but there is an OFF button to shut it down when you're done using it. But just in case you forget, the calculator shuts itself off when not in use.