Sell School & Office Equipment()✺iRIVER Scientific Calculator fX-991ES Plus Heavy Duty Engineering Calcul best price

- Measures L 3.25" x W .5" x H 6.30" - Plastic body and keys - With sliding cover - 417 functions, display expression same as textbook, easy menu function - Dual Power solar and battery - Requires 1 x LR44 battery (included) -Natural textbook display shows expressions and results exactly as they appear in the textbook -Over 280 functions, including fractions, statistics, complex number calculations, base arithmetic, linear regression, standard deviation, computer science, and polar-rectangular conversions -Multi-replay function allows you to backtrack step-by-step through calculations, where you can edit expressions and recalculate answers