Fx-991ex Advanced Scientific Calculator, 15-digit Lcd

The perfect choice for both high school and college students with 417 built-in functions. Natural textbook display shows formula and results exactly as they appear in the textbook. Improved math functionality with standard deviation, multi-replay function, logarithm log and list-based STAT data editor. Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 15; Display Characters x Display Lines: 16 x 2.