Casio FX-991ES Plus 2nd Edition Non-Programmable Scientific Calculator

The Casio FX-991ES Plus 2nd Edition is a non-programmable scientific calculator designed to handle a wide range of mathematical, scientific, and statistical calculations. It is a popular choice for students, professionals, and anyone in need of a reliable and versatile calculator. Below are key features and details of the device:

Key Features:

1. Natural Display (Natural Textbook Display):
   • The display shows mathematical expressions as they would appear in a textbook. This makes it easier to read and understand calculations, especially for complex formulas and fractions.
2. Multi-line Display:
   • The screen can display multiple lines of equations or results simultaneously, which is useful for solving problems step by step.
3. Functionality:
   • Supports over 500 functions, including:
     • Basic arithmetic operations
     • Trigonometric functions (sin, cos, tan, and their inverses)
     • Exponential and logarithmic functions
     • Statistical functions (mean, standard deviation, regression)
     • Complex number calculations
     • Matrix and vector operations
     • Permutations and combinations
     • Calculations involving fractions, percentages, and ratios
4. Solar and Battery Powered:
   • Dual power source: operates on a solar panel, and has a battery backup (one CR2032 battery) for low-light conditions.
5. Fraction Calculation:
   • The calculator allows you to perform operations directly with fractions, including simplification and conversion between improper fractions and mixed numbers.
6. Advanced Scientific Functions:
   • It includes advanced features like integration, differentiation, and solving of equations (e.g., quadratic equations).
7. Physical Design:
   • Compact, lightweight design with a durable body and a 2-line display screen.
   • The buttons are large and tactile, making it easy to operate the calculator during lengthy study or work sessions.
8. Iconic Function Keys:
   • Keys for statistical analysis, logarithms, trigonometric calculations, and more, all arranged for ease of use.
9. Programming Limitations:
   • As a non-programmable calculator, it doesn’t support programming or storing complex user-created programs, making it suitable for exams or standardized tests that prohibit programmable devices.
10. Durability:

• The Casio FX-991ES Plus 2nd Edition is known for its robust build, designed to withstand regular use in various environments.

Ideal Use:

• Students: Ideal for high school or university students, especially in subjects like mathematics, physics, engineering, and statistics.
• Professional Use: Suitable for professionals who need a reliable scientific calculator for everyday calculations.
• Exam-Compatible: It complies with exam regulations that prohibit programmable calculators, making it a popular choice for standardized tests.

Display Details:

• 2-line display: One line for input and the other for output, which is useful for checking intermediate results.
• High-resolution LCD: Ensures clear visibility of all functions, even in bright environments.

The Casio FX-991ES Plus 2nd Edition is an excellent choice for anyone needing a powerful, easy-to-use, and durable scientific calculator with advanced functions but without the need for programmability. It is highly regarded for its practicality, performance, and educational value.