Description
Reviews
| Brand | - |
| Category | Stationery, Educational Electronics & Office Supplies / Calculators |
| Origin | - |
| Brand | CASIO |
| Model Number | FX-991CN X |
| Display Type | High-resolution LCD with Natural Textbook Display |
| Power Source | Solar + Battery (LR44) |
| Number of Functions | 552+ |
| Language Interface | Chinese/English |
| Dimensions | 165.5 x 77 x 11.1 mm |
| Weight | Approx. 105g |
| Warranty | 1 Year Manufacturer Warranty |
| Package Contents | Calculator, Slide-on Hard Case, User Manual |
Anonymous
Mar 29, 2026
Rating: 4/5
Good value for money
Does everything the expensive graphing calculators do for basic science needs, without the high price tag. The only downside is that the case feels a bit flimsy.
Anonymous
Mar 28, 2026
Rating: 5/5
Authentic and Fast Delivery
Verified the serial number on the Casio website, and it is 100% genuine. The solar power works well even under classroom lighting. Very satisfied with this purchase.
Anonymous
Mar 23, 2026
Rating: 5/5
Best investment for engineering exams
I use this for my university engineering courses. The matrix and vector calculations are incredibly fast. The build quality feels solid and durable.
Anonymous
Mar 23, 2026
Rating: 5/5
Clear display is a game changer
The natural textbook display shows fractions and roots just like they appear in textbooks. It reduces errors significantly when checking my work during exams.
Anonymous
Mar 15, 2026
Rating: 4/5
Great features, slight learning curve
The functionality is amazing compared to my old model. It took me a day to get used to the new button layout, but once I did, solving complex equations became much faster.
Anonymous
Mar 03, 2026
Rating: 5/5
Perfect for High School Math
This calculator is exactly what I needed for my calculus classes. The Chinese menu makes it very easy to navigate, and the screen is crisp and clear. Highly recommended for students.
Q: Can the language be switched to English completely?
A: The FX-991CN X is designed primarily for the Chinese market. While some symbols are universal, the menu system and error messages are predominantly in Chinese. If you require a fully English interface, we recommend the FX-991EX international model.
Q: Is this calculator allowed in the Gaokao exam?
A: Yes, the CASIO FX-991CN X is generally approved for use in high school entrance exams and the Gaokao, as it does not have graphing or programming capabilities. However, please double-check with your specific local examination board regulations.
Q: Does it come with a protective hard case?
A: Yes, the package includes a slide-on hard case specifically molded to fit the FX-991CN X, providing protection against drops and scratches when carried in a backpack.
Q: How long does the battery last if kept indoors?
A: The calculator operates on a dual-power system (solar and battery). Even in low-light indoor conditions, the LR44 battery typically lasts for 2 to 3 years of regular student use before needing replacement.
Q: Can it perform complex number calculations?
A: Absolutely. This model supports complex number arithmetic, including polar and rectangular form conversions, which is essential for higher-level mathematics and physics courses.
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