Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural

The fx-991es plus 2 is an ideal scientific calculator for secondary school and university with natural "natural textbook display" display to display formulas and results just like textbooks. Allowed to maturity Equipped with 417 functions including: resolution of equations, calculation of synthesis values and variability indexes, matricial and vector calculation, regression and correlation coefficients, complex numbers, calc key (temporary memory formula), 40 physical constants, integral and differential numerical calculation. Combined Power Supply: Solar & LR-44 Button Alkaline Battery