Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Calculators
Origin	-
Model Number	FC-991CN
Display Type	High-resolution LCD with Natural Textbook Display
Power Source	Solar panel with backup battery (LR44)
Complex Number Support	Yes, including phasor notation and polar/rectangular conversion
Matrix Operations	Up to 4x4 matrix calculation and determinant finding
Equation Solver	Simultaneous linear equations (up to 4 unknowns) and polynomial roots
Base Conversion	Binary, Octal, Decimal, and Hexadecimal modes
Language Interface	Chinese (Simplified) menu and prompts
Exam Compliance	Approved for most high school and college engineering exams (non-programmable)
Dimensions	16.5 x 8.2 x 1.4 cm

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Essential for Graduate Entrance Prep

I used this daily while preparing for my graduate entrance exams. The equation solver saved me so much time on practice problems. Highly recommended for students.

Anonymous

Mar 19, 2026

Rating: 5/5

Perfect for Engineering Exams

This calculator handles complex numbers and matrices effortlessly. The Chinese interface is very clear, and it passed my university exam regulations without issue.

Anonymous

Mar 13, 2026

Rating: 5/5

Best choice for Circuit Analysis

As an electrical engineering student, the ability to switch between polar and rectangular forms instantly is a game changer. No text editing features means it's allowed in all my tests.

Anonymous

Mar 08, 2026

Rating: 4/5

Great functionality, steep learning curve

The features are incredible for the price, especially the phasor calculations. However, the manual is dense, so expect to spend some time learning the key combinations.

Anonymous

Mar 06, 2026

Rating: 4/5

Good value but screen could be brighter

Functionally, this matches more expensive brands. My only complaint is that the screen contrast is a bit low in dimly lit lecture halls, but still readable.

Anonymous

Mar 05, 2026

Rating: 5/5

Reliable and Fast

The processing speed is impressive even with large matrices. The solar power works well in classroom lighting, and the build quality feels durable.

5 FAQ

Q: Can it solve systems of equations with 4 variables?

A: Absolutely. This model can solve simultaneous linear equations with up to 4 unknowns and also finds roots for polynomial equations up to the 3rd degree.

Q: What type of battery does it use if solar is insufficient?

A: It uses one LR44 button cell battery as a backup power source when ambient light is too low for the solar panel to operate effectively.

Q: How do I perform phasor to rectangular conversion?

A: You can input a complex number in polar form and use the 'CMPLX' mode functions to toggle between polar (r∠θ) and rectangular (a+bi) formats instantly using the shift keys.

Q: Does the menu language switch to English?

A: No, this is the specific Chinese version (CN). The menu, error messages, and prompts are exclusively in Simplified Chinese.

Q: Is this calculator allowed in the National Graduate Entrance Examination?

A: Yes, the FC-991CN is non-programmable and does not have text editing capabilities, making it compliant with most standard university and graduate entrance exam regulations in China.

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