HP 35S 35S Programmable Scientific Calculator, 14-Digit LCD Sold as 1 EA. Choice of RPN or Algebraic entry system logic. Delivers a large two-line alphanumeric display with adjustable contrast, raised edges to protect the keys and a robust library of built-in functions and constants. Same time with an impressive array of programmable scientific functions. Have confidence that every time you turn on your calculator you make, results in dependable, worry-free performance and accurate results.