The HP 35s offers a unique way to switch between RPN and algebraic entry-system logic and is completely programmable, or you can use some of over 100 built-in functions. The clear 2-line display with adjustable contrast allows not only easy entry but also browsing history of previous calculations.
HP Prime G2
Graphing calculator HP Prime has a 3.5-inch full color touch screen, that delivers touch screen or keypad interaction. A range of advanced built-in and programmable functions, a rechargeable built-in long-life Li-Ion battery, easy way to switch between RPN, textbook and algebraic entry-system logic, an optional Wi-Fi adapter and more makes HP Prime the leading edge in graphing calculators.