Casio fx-991ES Plus is a non-programmable scientific calculator with 417 functions. This calculator comes with dual power: Battery and Solar for long usage without need of battery replacement.
Calculator has dot-matrix display with Natural Textbook Display feature for easy viewing and entering of long algebraic functions and equations. Calculator can perform Trigonometrical, Statistical, Integral, Differential, Permutation, Combination, Matrices, Vector calculations, and many more. Its keys are made of plastic for easy and fast usage. A suitable calculator for Engineering, Polytechnic, University and College students.