Ideal for college students engineers surveyors and medical personnel the HP 35s scientific calculator offers calculation versatility in one economical unit. For added versatility the HP 35s lets users choose between RPN or algebraic entry-system logic (no other scientific calculator offers both). It also features a large two-line alphanumeric display to view entries results menus and prompts with ease. The display also sports an adjustable contrast feature making it ideal to use both indoors and out. A robust library of 100+ built-in functions and constants also comes pre-loaded for immediate use right out of the box. A robust memory ensures even the largest calculations go smoothly and quickly and more than 800 independent storage registers allow users to store an equation then use it again to solve any variable or employ the equation in conjunction with any of the 100+ built-in functions. The calculator is backed by a manufacturer's 1-year limited warranty.