• Casio FX-991ES Plus scientific calculator, ideal for secondary school and university. • Natural textbook display shows formulas and results as in textbooks. • Equipped with 417 functions, including equation solving, calculus, statistics, matrix, and vector calculations. • Suitable for complex calculations in mathematics, physics, and engineering. • Widely used model, known for reliability and ease of use. • Features include integration, differentiation, and complex number calculations. • Durable design for everyday use.