The Casio FX-991ES Plus (2nd Edition) is a non-programmable scientific calculator with 417 built-in mathematical functions. Natural Textbook Display shows fractions and square roots exactly as they appear in paper-based equations. This updated version replaces the curved body with a rounded rectangular frame and upgrades plastic keys with a metallic finish.
417 Mathematical Functions: Includes integration, differential, vector, and matrix calculation capabilities. Handles complex engineering math without programmable logic.
Natural Textbook Display: Dot matrix screen shows 10+2 digits for mantissa and exponent. Equations match textbook formats on screen.
Solar and Battery Power: Two-way power source using light and an LR44 battery. Stays active during unexpected load shedding.
3-Year Warranty