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Professionals and college students have the flexibility no other scientific calculator can offer with the 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. Power Source(s): Battery; Display Notation: Engineering; Numeric; Number of Display Digits: 14; Display Characters x Display Lines: 12 x 2.