CASIO FX 991ES PLUS 2ND EDITION

CASIO FX‑991ES PLUS 2ND EDITION – Product Specifications

General Overview

The CASIO FX‑991ES PLUS 2ND EDITION is a non‑programmable scientific calculator designed for students and professionals, offering a wide range of mathematical functions including advanced calculus, matrix & vector calculations, statistics, and more. It features a Natural Textbook Display that shows expressions and results exactly as in textbooks, boosting usability and comprehension.

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 Key Features

• Natural Textbook Display – Shows equations and results as they appear in textbooks for easier understanding.

• Dual Power System – Solar powered with battery backup (LR44), ensuring reliable performance in varied lighting conditions.

• 417 Built‑in Functions – Covers a broad range of scientific, statistical, and algebraic computations.

• Non‑Programmable & Non‑Graphing – Suitable for educational and exam use.

• Slide‑on Hard Case Included for protection and portability.

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 Display

• Type: Dot Matrix LCD with Natural Textbook Display

• Digits: 10‑digit mantissa + 2‑digit exponent

• Display Size: 31 × 96 FULL DOT (clear, high‑resolution output)

• Algebraic Input Logic: Natural V.P.A.M. (Visually Perfect Algebraic Method)

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 Calculation Capabilities

Basic Functions

• Arithmetic operations, brackets, fractions, percentage, reciprocal, power, roots, etc.

• Trigonometric, logarithmic, and exponential calculations.

• Sexagesimal (DEG/RAD/GRAD) support.

Advanced Functions

• Equation Solver: Solve linear, polynomial equations.

• Calculus: Numerical integration and differentiation.

• Matrix & Vector Operations: Supports calculations for matrices and vectors.

• Complex Number Calculations – Handles real‑imaginary calculations.

• Base‑n Computation: Binary, octal, decimal, hexadecimal conversions.

• Random Integer & Number Generation.

Statistical Functions

• List‑based STAT editor.

• Standard deviation, regression analysis, summations (∑x, ∑y, etc.).

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 Memory & Replay

• Variable Memory: 9 stored variables.

• Multi‑Replay Function: Review and edit previous entries quickly.

• Answer Memory & Reset Function included.

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 Power & Performance

• Power: Solar & Battery (LR44 included)

• Auto Power Off to conserve battery life.

• Approx. Battery Life: Around 3 years.

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 Physical Specifications

• Dimensions: 161.5 × 77 × 11.1 mm

• Weight: Approx. 95 g

• Keys: Plastic keys designed for comfortable and accurate input.

• Finish: Includes robust build quality suitable for classroom and field use.

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Ideal For

Students from secondary school to university level, professionals in engineering, science, accounting, and anyone needing advanced scientific calculation power with an intuitive interface.