Attributes

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

6 reviews

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.

5 FAQ

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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