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The Casio fx-991 MS is a scientific calculator with many powerful features. Some of these can greatly reduce the effort when solving problems. It is both Solar powered and battery powered; it has 401 functions, store 80 numbers and can deal with complex numbers, equations, numerical differentiation and integration etc. The calculator is almost in new condition. * Two way power * 401 Functions * Dot Matrix * 2-Line Display, 10+2 Digits, Plastic Keys * Multi-replay function, Matrix calculations, Equation calculations, Vector calculations, Differential calculations, SOLVE function |