Casio FX991CW Advanced Scientific Calculator

High Resolution Display to view more data like spreadsheets and 4x4 matrix calculations, Natural Text book display - symbols and numbers appear just as they do in textbook, Numeric Integration/Differentiation. 552 functions, Simultaneous and Polynomial Solver, Solar Powered with Battery Backup (LR44 Button Cell Battery Included), Rounded keys for easier inputs, 4-tone display makes operation easier, Intuitive navigation with cursor keys, Works with ClassPad.net