Reliable and high-performance, this Casio fx-991s is a classic scientific calculator favored by students and professionals for its versatility and durable design. Featuring the V.P.A.M. (Visually Perfect Algebraic Method) system, it allows you to enter expressions exactly as they are written in textbooks.

• Model: Casio fx-991s

• Power Source: Two-Way Power (Solar and Battery) for uninterrupted use in any lighting.

• Display: 10+2 Digits with a clear LCD screen.

• Key Features: Supports Complex number calculations, Engineering notation, Trigonometry, and 40 scientific constants.

• Safety: Features Auto Power-Off to preserve battery life.

Condition: Used but fully functional. The screen is clear and all buttons are responsive. Comes with its original slide-on hard case.

Manufacturing Info

• Brand: Casio

• Technology: Japan-based engineering, widely used in secondary and post-secondary education.