New version of the Casio 991 EX and 4-times better resolution than the Casio 991ES Plus for viewing longer expressions Natural Textbook Display - Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbols as they appear in textbooks Scientific calculator with inbuilt QR code function - Calculator can generate QR code - Useful from graphical visualization and access to user manual using your smart phone Faster than any previous Casio non-programmable scientific calculator Simultaneous and polynomial solvers up to degree four, numerical integration, differentiation, statistics, matrix, vector computation