In examination, time is the most important resource, and therefore your calculator must compute expressions quickly. The latest Scientific Calculator from Casio, fx-991EX Classwiz is 4 times faster than previous model fx-991ES Plus and has 4 times better resolution for easier viewing. ClassWiz has intuitive user interface and high-performance functions, so ideal for education. It is the most recommended Scientific Calculator by teachers across the world for students community from school to college and university level. • Number of Functions : 552 552 Functions for easy and fast Calculations for all your Mathematical and engineering problems • QR Code QR Code feature generate graphical graphical visualization of given equation in your smart device. It also helps you to access calculator user manual anytime, anywhere. • Advanced Polynomial & Matrix Solve up to 4 degree polynomial, inequalities and simultaneous equation with four variables. Define and calculate up to 4 by 4 matrix • 4-times better resolution than Casio 991ES Plus for easier viewing of long expressions • Natural Textbook Display- Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbol just as they appear in textbooks • Scientific Calculator with inbuilt QR Code function --Calculator can generate QR Code -- Useful from graphical visualization & accessing user manual using your smart phone • Faster than any previous Casio Non-Programmable Scientific Calculator • Up to Four Degree Simultaneous and Polynomial Solver, Numerical Integration, Differentiation, Statistics, Matrix, Vector Calculation • Attractive and elegant look with metallic keys, Colour coded keypad for easy key differentiation • Dual Powered - Solar & Battery Solar powered when light is sufficient, battery powered when light is insufficient.