Casio fx-991ES PLUS 2 Scientific Calculator - fx-991ES PLUS 2
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Full details
The Casio fx-991ES PLUS 2 is designed for secondary school and university students needing a reliable scientific calculator. Its key benefit is the 'natural textbook display,' which shows equations as they appear in textbooks, easing comprehension. A significant caveat for international users is its Japanese voltage (90-110V) and plug type (A or B), potentially requiring a voltage transformer and plug adapter for use outside Japan. This calculator offers a comprehensive set of functions, including regression and correlation coefficients, 24 brackets, and dual solar and battery power.
All features
| Model Part Number | fx-991ES PLUS 2 |
|---|---|
| Brand | CASIO |
Extended Product Information
FAQs
What does 'natural textbook display' mean?
It means the calculator displays mathematical expressions, fractions, and symbols exactly as they are written in textbooks, making them easier to read and input correctly.
Can I use this calculator in the US without any issues?
No. The calculator is designed for 90-110V Japanese voltage. You will need a voltage transformer and a plug adapter to use it safely and correctly in the US (which typically uses 120V).
How does the dual power source work?
The calculator can operate using solar power under sufficient light. It also has a battery backup for use in low-light conditions or when solar power is insufficient.
What types of calculations can this calculator perform?
It performs a wide range of scientific calculations, including trigonometry, logarithms, statistics (regression and correlation coefficients), fractions, and more, with 24 bracket capabilities.
Is this calculator suitable for advanced engineering or programming?
This model is ideal for secondary and university-level math and science. For advanced engineering or programming, you might consider Casio's graphing calculator series.
How do I clean the calculator?
Wipe the calculator gently with a soft, dry cloth. Avoid using liquids or abrasive cleaners.
What is the warranty period for this product?
Warranty information typically varies by region and seller. Please refer to the product packaging or contact the seller directly for specific warranty details.
Troubleshooting
Display is blank or faint.
Ensure sufficient light is available for solar power. Check and replace batteries if they are depleted.
Calculator is unresponsive.
Press the ON button firmly. If the issue persists, try removing and reinserting the batteries (if applicable) or performing a reset if a reset button is available (consult manual for reset procedure).
Incorrect calculation results.
Verify that the calculator is in the correct mode (e.g., 'COMP' for general calculations, 'STAT' for statistics). Double-check the input and ensure all brackets are closed properly.
Buttons are not registering input.
Ensure the buttons are clean and free of debris. If the issue persists, there may be an internal hardware problem.
Pros and Cons
Pros
- Natural display significantly improves readability and input.
- Comprehensive function set suitable for secondary and university-level studies.
- Dual power source offers flexibility and reliability.
- Durable and designed for educational settings.
Cons
- Requires a voltage transformer and plug adapter for use outside Japan due to Japanese voltage specifications (90-110V) and plug types.
- Complex functions may have a learning curve for beginners.
- Not designed for advanced programming or graphing functions found in higher-end models.
Setup, Compatibility & Care
Setup:
- Ensure the calculator is exposed to adequate light (natural or artificial) for the solar power to function.
- Insert batteries if required, ensuring correct polarity.
Compatibility:
- Voltage and Plug: This calculator is designed for Japanese voltage specifications (90-110V) and uses Japanese plug types (Type A or B).
- Voltage Transformer/Plug Adapter: For use in regions with different voltage standards (e.g., 110-240V in many Western countries), a compatible voltage transformer and a Type A or B plug adapter are required. Operating the device without a transformer may cause malfunctions or damage. The seller is not responsible for such issues.
Care:
- Keep the calculator clean by wiping it with a soft, dry cloth.
- Avoid exposing it to extreme temperatures or moisture.
- Protect the display from scratches.