Casio fx-991ES PLUS (2nd Edition) Scientific Calculator
The Casio fx-991ES PLUS 2nd Edition is a reliable, high-performance scientific calculator designed specifically for high school and university students taking advanced mathematics, physics, engineering, and computer science courses.
Key Features at a Glance
- 📐 Natural Textbook Display: Displays fractions, derivatives, integrals, roots, and equations exactly as they appear in standard textbooks.
- ⚡ 417 Built-in Functions: Equipped with comprehensive mathematical tools to handle everything from basic algebra to complex matrix calculations.
- ☀️ Dual Power System: Solar-powered with battery backup (
LR44) to ensure non-stop performance during critical exams.
- 🖥️ High-Resolution Screen: Clear dot-matrix screen provides easy readability and seamless menu navigation.
- 🛡️ Durable Design: Comes with a protective slide-on hard case to guard against daily drops and scratches in your backpack.
Technical Specifications
| Feature |
Details |
| Brand / Model |
Casio fx-991ES PLUS (2nd Edition) |
| Total Functions |
417 Functions |
| Display Type |
Natural V.P.A.M. (Dot-Matrix Display) |
| Power Source |
Dual (Solar + Battery) |
| Dimensions |
Approx. 161.5 × 77 × 11.1 mm |
| Weight |
~95g (including battery) |
Core Functionality & Capabilities
- 🔢 Algebra & Equations: Equation solver, system of linear equations (up to 3 variables), polynomial equations, and inequalities.
- 📈 Calculus & Advanced Math: Numerical integration, differentiation, summation ($\sum$), and vector/matrix operations up to $3 \times 3$.
- 📊 Statistics & Probability: Regression analysis, standard deviation, combinations ($nCr$), and permutations ($nPr$).
- 💻 Base-N & Complex Numbers: Base-$n$ conversions (Hex, Bin, Oct, Dec) and complex number calculations.
Why Choose This Calculator?
- 🎓 Exam Approved: Permitted in most major school, college, and competitive standardized examinations worldwide.
- 💡 Error-Free Entry: Standardized multi-replay feature lets you step back through calculations to edit inputs without restarting from scratch.
- 🎒 Portable & Lightweight: Compact body designed for daily portability in school bags or pencil cases.
Are you looking for specific exam approval guidelines (like SAT, ACT, or A-Levels) for this model, or would you like a quick comparison against other Casio models?
