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OnBuy.com£31.53Visit shop Casio Fx-991Es Plus 2 Scientific Calculator With 417 Functions And Display, Natural
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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.
| Model Part Number | fx-991ES PLUS 2 |
|---|---|
| Brand | CASIO |
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.
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).
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.
It performs a wide range of scientific calculations, including trigonometry, logarithms, statistics (regression and correlation coefficients), fractions, and more, with 24 bracket capabilities.
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.
Wipe the calculator gently with a soft, dry cloth. Avoid using liquids or abrasive cleaners.
Warranty information typically varies by region and seller. Please refer to the product packaging or contact the seller directly for specific warranty details.
Ensure sufficient light is available for solar power. Check and replace batteries if they are depleted.
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).
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.
Ensure the buttons are clean and free of debris. If the issue persists, there may be an internal hardware problem.
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