Description
Reviews
| 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 |
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.
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.
Stainless Steel Tire Stone Removal Hook - Multi-Function Car Tire Cleaning Tool for Picking and Scraping Stones
$5.03
Cart Cover Rice Husk Charcoal Premium Plant Ash Grain Shell Carbon Natural Organic Fertilizer for Vegetables Succulents and Flowers
$6.55
Aojilong Automotive Plastic Restorer – Revives Black Trim, Repairs Aging, Crystal Coating Finish
$28.80
Hotel Meat Warmer Lamp - Buffet Heating Light for Cafeterias and Restaurants
$5,989.00
Topmodel Children's Watercolor Coloring Book Set with Pens, Baby Graffiti Sketchbook, Fill-in Storybook 3073
$119.09
Children's Potty Training Seat for Boys and Girls, Toddler Toilet Trainer with Urinal Bucket
$17.90
265/70R17 AT Off-Road Tire, Also Available in 205/215/225/235/45/50/55/60R18/20 High-Performance Sizes for 19-inch Wheels
$898.00
CANDLE.LAB | Silver Metal and Wood Wick Centering Device - DIY Tool for Aromatherapy Container Candles
$2.50
Custom Solid Wood Plaque - Antique Style Wooden Storefront Sign, Door Plaque, Carved Wood Board with Arched Couplets
$50.00
Industrial Scouring Pads - Stainless Steel Brushing and Rust Removal for Iron Plates - Heavy-Duty Kitchen Cleaning and Polishing
$17.62
Supply Fully Automatic Self-Cleaning Filter Pipeline Backwash Filtration Machine Stainless Steel Scraper Filter
$9,600.00
Fangxinyue Scented Candle Glass Windshield - High Borosilicate Cover to Improve Memory Ring Burning
$29.90
Hanging Drainage Basket Kitchen Sink Strainer Plastic Storage Rack Food Waste Filter
$2.85
Over-Toilet Storage Cabinet with Doors - Multi-Tier Floor Standing Bathroom Organizer for Narrow Spaces
$258.00
Inth A6 Multifunctional Leather Journal - Vintage Sketchbook, Watercolor Pad, and Doodle Book with Replaceable Cotton Refill Pages for Students
$26.90
Beginner Chinese Painting Line Drawing Copybook: Animals, Flowers, Figures, and Landscapes
$18.80
vantkevin Scented Candle Tool Set for Extinguishing Flames and Snuffing Wicks
$17.60
Multi-Function Car Tire Stone Remover Tool - Hook Pick and Screwdriver for Tread Cleaning
$3.80
Pad Printing Machine Parts: Fixed Ink Roller Screw, Steel Plate Mounting Screw, Blade Holder Adjustment Nut, Blade Clamp Screw
$0.30
Minggu Cast Steel Speed Bump - Iron Speed Limit Buffer for Road Ramps and Slopes
$104.12
Lifting Chain Rigging with Shackles and Hooks - Manganese Steel Chain for Towing and Hoisting Cargo 5 Ton, 3t, 2m, 1m
$92.90
309 PCB Conformal Coating - Triple Protection Acrylic UV-Cured Moisture Resistant Paint by Dima
$462.50
Biliansheng Non-Shaven Hair Transplant and Follicle Detection Service for Men and Women
$88.00
Mattel UNO Cards Desktop Happy Casual Party Multiplayer U-No Official Game Interactive Poker Cards
$22.90
Zero-Basis Electric Guitar Intro: 7-Week Self-Study Plan with Practice Exercises, Error Correction, and Materials
$472.10
Hongxing Ink for Brush Calligraphy - Large Bottle Black Ink for Beginners, Students, and Traditional Chinese Painting (Light Glue, Ancient Formula, Soot-based)
$5.78
Loose Aquamarine Beads - Gemstone Bracelet Components Including Amber, Southern Red Agate, Gold Rutilated Quartz, Ice-Grade Devil Blue Donghai Crystal
$6.72
Mia Sketch Blending Stump Set for Highlights and Shadows, Professional Art Supplies Including Paper Blenders, Makeup Sponges, and Cotton Tips for Still Life Drawing
$4.00
Custom Tactical Waterproof and Shockproof Knife Box - EDC Carry Case for Folding Knives, Headphones, Data Cables, and Tools
$21.99
Wang Xizhi's Hundred-Rhyme Song of Cursive Script - Taipei Palace Museum Edition Hardcover High-Definition Replica Decorative Art Print
$32.90
![[10 Boxes] M&G Staples 24/6 Universal No. 12 Stapler Pins, Uniform Binding Nails, Office Stationery, Small Stainless Steel Staples](https://www.gosteppe.com/cache/medium/product/393106/legacy-main-d2d0aeb221cb42ffcbb9d83a.webp)
![[Customizable] Blank DIY Bookmarks - Thickened Hard Cardstock in Multiple Sizes with Tassels for Kindergarten and Elementary Art, Calligraphy, and Reading Gifts](https://www.gosteppe.com/cache/medium/product/386159/legacy-main-05a2e5e73e5ac60017fbef5e.webp)
