1. Product Overview
The Casio FX-991ES Plus 2nd Edition Scientific Calculator is a high-performance, non-programmable scientific calculator designed for students, engineers, and professionals who require advanced mathematical capabilities. Featuring Natural V.P.A.M. (Visually Perfect Algebraic Method) technology, this calculator displays mathematical expressions exactly as they appear in textbooks, including fractions, square roots, exponents, and integrals. With 417 built-in functions, this model supports complex calculations including matrix and vector operations, numerical integration and differentiation, equation solving, and statistical analysis. Its dual-power system (solar with battery backup) ensures reliable operation in any environment, while the slide-on hard case provides protection during transport.
For those looking for other reliable calculator options, the Scientific Calculator Fx 991Es Plus offers similar functionality, while the Scientific Calculator Fx 991Ex provides the next-generation Classwiz experience.
Key features from the product:
| Feature | Details |
|---|---|
| Brand | Casio |
| Model | FX-991ES Plus 2nd Edition |
| Display Type | Natural Textbook Display (Dot Matrix 31 x 96) |
| Number of Functions | 417 |
| Digit Capacity | 10-digit mantissa + 2-digit exponent |
| Display Input Logic | Natural V.P.A.M. |
| Key Attributes | Natural display, equation solver, matrix/vector operations, numerical integration & differentiation, 40 scientific constants, metric conversions |
| Perfect For | Engineering students, science students, professionals, exam use |
2. Brand Overview – The Story Behind Casio
| Historical Fact | Detail |
|---|---|
| Brand | Casio |
| Founded | 1946 |
| Headquarters | Tokyo, Japan |
| Reputation | Global leader in electronics, calculators, watches, and musical instruments |
| Product Range | Scientific calculators, graphing calculators, financial calculators, basic calculators |
| Global Presence | Available in over 100 countries worldwide |
Casio has been a pioneer in the calculator industry since introducing the world's first compact electric calculator in 1957. With over seven decades of innovation, Casio has established itself as the gold standard for scientific calculators in educational and professional settings worldwide.
The FX-991ES Plus series represents Casio's commitment to educational excellence and professional precision. Building on the success of the original ES series, the 2nd Edition incorporates the advanced Natural V.P.A.M. system, which mimics the visual layout of a textbook, making complex expressions easier to read and understand.
Casio calculators are renowned for their rigorous quality testing, wear-resistant printing, and drop-resistant bodies. The brand complies with ISO 14001 and ROHS policies, ensuring their products are manufactured without harmful substances. They have become a trusted tool for students and professionals in over 100 countries, with many users praising their unmatched speed and accuracy.
You can explore more Casio Fx 991Es Plus Scientific Calculator and other calculators to see the brand's wide range of offerings.
3. What's in the Box
| Quantity | Item |
|---|---|
| 1 | Casio FX-991ES Plus 2nd Edition Scientific Calculator |
| 1 | Slide-on Hard Case |
| 1 | User Manual |
| 1 | LR44 Battery (Pre-installed) |
Product Specifications:
| Specification | Detail |
|---|---|
| Model | FX-991ES Plus 2nd Edition |
| Display Type | Dot Matrix LCD (31 x 96 pixels) |
| Digit Capacity | 10 + 2 (Mantissa + Exponent) |
| Number of Functions | 417 |
| Display Logic | Natural V.P.A.M. |
| Power Source | Solar + LR44 Battery |
| Battery Life | Approx. 3 years (1 hour operation/day) |
| Dimensions | 11.1 x 77 x 161.5 mm |
| Weight | 95 g (including battery) |
| Warranty | 3 Years (Manufacturer) |
4. Build Quality & Material
| Design Feature | Benefit |
|---|---|
| Body Material | High-impact plastic with drop-resistant construction |
| Key Material | Durable plastic keys with wear-resistant printing |
| Hard Case | Slide-on, attachable and detachable from both directions |
| Display Quality | High-resolution dot matrix for clear visibility |
| Durability | Rigorous testing ensures long-lasting performance |
The Casio FX-991ES Plus is engineered with drop-resistant construction and wear-resistant printing, ensuring it can withstand the rigors of daily use in academic and professional settings. The slide-on hard case provides essential protection against scratches, impacts, and dust. The hard case is designed to be attachable and detachable in both directions, adding convenience for users.
The keys are made from high-quality plastic with wear-resistant printing, ensuring that the labels remain visible even after extensive use. The calculator undergoes rigorous quality tests to ensure maximum durability and reliability, with Casio's quality standards being industry-leading.
5. Design & Aesthetics
| Design Feature | Benefit |
|---|---|
| Display | Large, high-contrast dot matrix display |
| Key Layout | Scientific layout with easy-to-press cursor and function keys |
| Hard Case | Slide-on protective case for storage |
| Color | Classic black with ergonomic design |
| Display | Natural Textbook Display for easy reading |
The FX-991ES Plus features a classic, professional design with a highly visible, high-contrast dot matrix display. The Natural Textbook Display format shows expressions exactly as they appear in textbooks, making number reading easy and fast. The keys are designed to be easy-to-press with highly visible markings, reducing input errors. The calculator's slim profile and lightweight construction make it portable and comfortable to use for extended periods.
6. How the Calculator Works – The Calculation Mechanism
| Mechanism Feature | Benefit |
|---|---|
| Input Logic | Natural V.P.A.M. (Visually Perfect Algebraic Method) |
| Display Modes | MathO (Natural Display), LineO (Linear Display) |
| Expression Entry | Textbook-style input for fractions, exponents, integrals |
| Settings | Configurable via SETUP menu |
| Initialization | Quick reset to default settings |
The FX-991ES Plus uses Natural V.P.A.M. technology, allowing mathematical expressions to be entered and displayed exactly as they appear in textbooks. The user can choose between MathO (Natural Display for input and output) or LineO (Natural input, Linear output) modes. This feature significantly reduces input errors and improves comprehension, making complex calculations more intuitive.
The calculator can be configured through the SETUP menu to control display format, angle unit (Degrees, Radians, Grads), number format (Fix, Sci, Norm), fraction display format (Mixed or Improper), complex number format (Rectangular or Polar), and other settings.
7. Natural Textbook Display – Enhanced Comprehension and Accuracy
| Feature | Benefit |
|---|---|
| Display Format | Fractions, exponents, integrals appear as written on paper |
| Output | Results displayed in textbook format |
| Error Reduction | Fewer calculation errors due to visual clarity |
| Learning | Easier to understand complex expressions |
The Natural Textbook Display is a defining feature of the FX-991ES Plus. It shows fractions, square roots, exponents, integrals, and other expressions exactly as they appear in textbooks. This display reduces the number of calculation errors and significantly decreases calculation time. Users can easily verify that they have entered the correct expression before calculating, making it an invaluable tool for learning and professional work.
The display is capable of showing up to 16 characters and 1 line in Natural Display mode, with 10-digit mantissa and 2-digit exponent in linear display.
8. Advanced Functions – Comprehensive Performance
| Feature | Benefit |
|---|---|
| Number of Functions | 417 |
| Scientific Constants | 40 |
| Metric Conversions | 40 pairs |
| Matrix Operations | Full matrix calculations |
| Vector Operations | Full vector calculations |
| Equation Solving | Simultaneous and polynomial equations |
| Calculus | Numerical integration and differentiation |
| Complex Numbers | Full complex number calculations |
| Statistics | Regression analysis, standard deviation, permutations, combinations |
The FX-991ES Plus is equipped with 417 built-in functions, making it one of the most comprehensive scientific calculators available. Key function categories include:
- Algebra: Matrix calculations, vector calculations, complex number calculations, equation solving (simultaneous & polynomial)
- Calculus: Numerical integration and differentiation
- Statistics: Regression analysis (7 types), standard deviation, permutations (nPr), combinations (nCr)
- General: 40 scientific constants, 40 metric conversions, function tables, random integers
- Base-n Calculations: Binary, octal, decimal, and hexadecimal conversions
User reviews confirm that the calculator handles linear equations in three variables, matrix multiplication, vector multiplication, integration, differentiation, and complex solutions with ease.
9. Convenience – Ready to Use Every Time
| Convenience Feature | Benefit |
|---|---|
| Dual Power | Solar + Battery ensures continuous operation |
| Battery Life | 3 years with normal use |
| Auto Power Off | Saves battery life |
| Hard Case | Protects calculator during transport |
| Quick Initialization | Easy reset to default settings |
| Non-Programmable | Approved for use in many exams |
The FX-991ES Plus is designed for maximum convenience. The dual-power system combines solar power with a battery backup, ensuring reliable performance in any lighting condition. The auto power-off feature conserves battery life, while the slide-on hard case protects the calculator during storage and transport.
The calculator can be quickly initialized to factory default settings through the SETUP menu. Its non-programmable nature makes it approved for use in many examinations, including Cambridge International exams.
10. Perfect for Engineering Students, Science Students & Professionals
| Application | Use Cases |
|---|---|
| Engineering | Matrix operations, complex numbers, calculus, equation solving |
| Science | Statistics, constants, conversions, differential equations |
| Mathematics | Algebra, calculus, statistics, probability |
| Architecture | Trigonometry, geometry, measurements |
| Exams | Approved for university and professional exams |
The FX-991ES Plus is a versatile tool suitable for various fields:
- Engineering Students: Essential for matrix operations, vector calculations, integration, and differential equations.
- Science Students: Ideal for statistics, scientific constants, metric conversions, and complex number calculations.
- Mathematics Students: Perfect for algebra, calculus, probability, and statistics.
- Professionals: Reliable for engineers, surveyors, architects, and scientists.
- Exam Use: Approved for NZQA, Cambridge International, and many university exams.
11. Who Is This For?
| User | Suitability | Reason |
|---|---|---|
| Engineering Students | ⭐⭐⭐⭐⭐ | Essential for matrix, vector, and calculus work |
| Science Students | ⭐⭐⭐⭐⭐ | Ideal for statistics, constants, and conversions |
| Mathematics Students | ⭐⭐⭐⭐⭐ | Perfect for algebra, calculus, and probability |
| Architects | ⭐⭐⭐⭐☆ | Useful for geometry and trigonometry |
| Professionals | ⭐⭐⭐⭐⭐ | Reliable for engineers and scientists |
| High School Students | ⭐⭐⭐⭐⭐ | Approved for advanced coursework |
The Casio FX-991ES Plus is an excellent choice for:
- Engineering, Science, and Mathematics Students: Offers all necessary advanced functions
- High School Students in Advanced Courses: Suitable for A-Levels, IB, and AP classes
- University Students: Approved for use in many university examinations
- Professionals: Engineers, architects, scientists, and surveyors
- Anyone Taking Exams: Non-programmable design makes it exam-friendly
12. Comparison with Alternatives
| Feature | FX-991ES Plus 2nd Ed | FX-991EX Classwiz | FX-82ES Plus 2nd Ed |
|---|---|---|---|
| Functions | 417 | 550+ | 252 |
| Matrix | 3x3 | 4x4 | No |
| Vectors | Yes | Yes | No |
| Spreadsheet | No | Yes | No |
| Display | Natural Textbook | High-resolution | Natural Textbook |
| Best For | Advanced Students | Professionals | Basic Students |
Why Choose the Casio FX-991ES Plus?
- Natural Textbook Display: Shows expressions exactly as in textbooks
- 417 Functions: Comprehensive for advanced mathematics
- Matrix & Vector Operations: Essential for engineering students
- Non-Programmable: Approved for exams
- Trusted Brand: Casio quality and reliability
When to Consider Alternatives:
- FX-991EX Classwiz: If you need more advanced features like spreadsheets and larger matrix support. Check out the Scientific Calculator Fx 991Ex.
- FX-82ES Plus: If you need a basic calculator with natural display. Explore the Casio Fx 82Es Plus Scientific Calculator.
13. Pros and Cons 💭
What We Loved ❤️
- Natural Textbook Display – Shows expressions as written in textbooks
- 417 functions – Comprehensive for advanced math
- Matrix & vector operations – Essential for engineering
- Dual power – Solar + battery ensures reliability
- Non-programmable – Approved for exams
- 40 scientific constants & 40 metric conversions
- Equation solver – Simultaneous and polynomial
- Numerical integration & differentiation
- Hard case included – Protects calculator
- Trusted Casio quality – Rigorous testing
What Could Be Better 🤔
- Cannot perform LCM and GCM calculations – Limited number theory support
- Limited to 3x3 matrix maximum – May be insufficient for advanced users
- Not programmable – May lack some advanced functions
- Classwiz model may offer additional functions – Consider FX-991EX
14. What to Watch Out For
| Potential Issue | Advice |
|---|---|
| Non-Programmable | This calculator is intentionally non-programmable, which makes it suitable for exams but limits customization. |
| Matrix Size | Matrix calculations are limited to 3x3 maximum. |
| No LCM/GCM | The calculator cannot perform Least Common Multiple or Greatest Common Multiple calculations directly. |
| Exam Approval | Always verify with your exam board that this specific model is approved for your exam. It is approved for NZQA, Cambridge International, and many university exams. |
| Dual Power | While the calculator has solar power, it still requires a functional battery. The battery life is approximately 3 years. |
15. Frequently Asked Questions (FAQs)
Q1: How many functions does the Casio FX-991ES Plus have?
A: The calculator features 417 built-in functions, including calculus, matrix operations, vectors, statistics, and equation solving.
Q2: What is Natural V.P.A.M.?
A: Natural V.P.A.M. (Visually Perfect Algebraic Method) is Casio's technology that displays mathematical expressions exactly as they appear in textbooks, showing fractions, square roots, exponents, and integrals in their natural textbook format.
Q3: Is the Casio FX-991ES Plus allowed in exams?
A: Yes, it is non-programmable and approved for use in many examinations, including NZQA, Cambridge International, and various university exams.
Q4: Does it work without batteries?
A: Yes, the calculator features solar power as its primary power source, with a battery backup for low-light conditions. However, it still requires a functional battery for optimal operation.
Q5: What is the battery life of the calculator?
A: The LR44 battery has an approximate life of 3 years based on one hour of operation per day.
Q6: Can I perform matrix calculations?
A: Yes, the calculator supports matrix operations for up to 3x3 matrices.
Q7: Is this calculator suitable for engineering students?
A: Yes, it is highly recommended for engineering students due to its matrix operations, vector calculations, integration, differentiation, and equation solving capabilities.
Q8: What is the warranty period?
A: The calculator comes with a 3-year manufacturer warranty.
16. Final Verdict ⭐
| Feature | Rating | Why We Feel This Way |
|---|---|---|
| Build Quality | ⭐⭐⭐⭐⭐ | Drop-resistant construction with hard case protection |
| Functionality | ⭐⭐⭐⭐⭐ | 417 functions cover all major advanced mathematics |
| Display Quality | ⭐⭐⭐⭐⭐ | Natural Textbook Display for clear, easy reading |
| Ease of Use | ⭐⭐⭐⭐☆ | Intuitive layout but requires learning |
| Value for Money | ⭐⭐⭐⭐⭐ | Exceptional value for the features offered |
| Exam Suitability | ⭐⭐⭐⭐⭐ | Non-programmable design approved for exams |
Overall Score: 4.8 / 5 – Highly Recommended ⭐⭐⭐⭐
17. Overall Assessment
The Casio FX-991ES Plus 2nd Edition Scientific Calculator is a premium, reliable, and highly capable scientific calculator that delivers exceptional performance for students, engineers, and professionals. Its Natural Textbook Display, 417 functions, and robust construction make it a standout choice for anyone needing advanced mathematical capabilities.
What Makes It Great 🌟
- Natural Textbook Display: Significantly reduces errors by showing expressions exactly as written in textbooks.
- Comprehensive Function Set: 417 functions cover all major advanced mathematics requirements.
- Exam-Friendly: Non-programmable design makes it approved for many exams.
- Durable Construction: Drop-resistant body and hard case ensure long-lasting use.
- Dual Power: Solar + battery provides reliable operation in any environment.
- Trusted Brand: Casio's reputation for quality and innovation is unmatched.
What to Watch Out For ⚠️
- No LCM/GCM: Cannot directly calculate Least Common Multiple or Greatest Common Multiple.
- Limited Matrix Size: Maximum 3x3 matrix operations.
- Non-Programmable: Lacks programmability, which may be desired in some advanced applications.
Rating: 4.8 / 5 Stars ⭐⭐⭐⭐
The Casio FX-991ES Plus 2nd Edition is a must-have for students and professionals who need advanced mathematical capabilities. Its combination of natural display, comprehensive functionality, and trusted quality makes it the gold standard in scientific calculators. Whether you're an engineering student tackling complex calculations or a professional requiring reliable performance, this calculator delivers unmatched accuracy, speed, and ease of use. 🧮📐
Short Description
- Non-Programmable Scientific Calculator with 417 Functions
- Natural Textbook Display – Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbols just as they appear in textbooks
- List Based Stat-Data Editor for Easy Viewing and Statistical Calculation
- Probability, Calculus, Permutation Combination, Random Number Calculation features
- Table Function for Function exploration
- Colour coded keypad for easy key differentiation
- Dual Powered – Solar & Battery. Solar powered when light is sufficient, battery powered when light is insufficient.
- Comes with slide-on hard case
- Suitable for Engineering, University, & School students
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| Barnd | Scientific |
|---|---|
| Product Category | Stationery & Craft / School & Office Equipment / Calculators |
| Package Dimensions (CM) | 165 X 80 X 5 |
| Weight | 0.3 Kg -/+ |
| Product SKU | 6953048609916 |
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