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.
Chineng Commercial Automatic Small Scallion Chopper, Multi-function Vegetable Cutter for Chili Slicing and Filling Preparation in Cafeterias
$16,200.00
G80 Lifting Chain with Hook Head, Manganese Steel Alloy Chain for Hoisting Stones and Towing
$79.00
Car Interior Button Frame and Window Switch Chrome Panel, New Energy Vehicle ABS Parts with Hot Melt Welding and Injection Molding
$96.00
Foldable Multi-Function Tire Stone Removal Tool for Cars
$53.60
Premium 3D Printing Pen RP600A, No Display, Best-Selling Gift for Kids, 3D Pen RP6
$230.15
Marie's Thickened 8K Watercolor Pad, 16K Portable Sketchbook for Beginners and Art Students - Travel-friendly Multi-use Painting Book
$7.23
Car Tire Stone Removal Hook - Stainless Steel Multi-Function Tool for Cleaning Pebbles from Treads
$3.80
Premium Thickened 50% Wool Felt Mat for Calligraphy and Chinese Painting - Dedicated Tablecloth for Four Treasures of the Study; Ideal for Student Practice
$2.59
Fish Chunk Meat Tumbling Mixer Dried Meat Seasoning Mixer Red Oil King Oyster Mushroom Mixing Machine Yikang Machinery
$17,419.00
Custom Company Door Plaques, Bronze Plates, Outdoor Stainless Steel Signs, Factory Display Boards, Metal Advertising Signs with Etched Customization
$25.50
Blower Motor for BMW 5 Series, 6 Series, 7 Series, 8 Series, F90 M5, G Chassis
$480.00
Large Size Thickened Felt Mat for Calligraphy, Wool Felt Pad for Brush Practice, Traditional Chinese Painting Desk Mat
$13.50
Creative Studio Sign Custom Door Plate Company Billboard LOGO Design Storefront Display
$119.00
Router Storage Box, Cable Organizer, WiFi Set-Top Box Stand, Gigabit Broadband Shelf with Wall Mount
$23.60
Baby Rattle with Teether for 0-6 Month Newborns, Sand Shaker and Hand Drum for Visual and Auditory Tracking
$10.50
Splicable Folding Food Warmer Partition Temperature Control Insulation Plate Hot Dish Plate Induction Cooker Plate Constant Temperature Heating Food Warmer Table Mat
$315.00
Marie's Kneaded Eraser Cotton for Sketching, Student-Use Blending Stump, Makeup Sponge for Art Students, Paper Blending Tool, Soft Absorbent Water-Drop Sponge Ball for Sketching
$8.33
Soft Cheese Processing Equipment, Lab-Type Cheese Stretching and Mixing Machine, Multi-Function Hot Water Stretching Unit
$210,210.00
Imported IKO Needle Roller Bearings TAF121912, 121915, 121916, 142212, 142216, 142220
$26.00
Portable Watercolor Sketchbook – 100% Cotton Mini Square Pocket Book for Travel, On-the-Go Sketching, Tear-Off Art Pages
$10.90
Dongguan Rotary Pad Printer Manufacturer - Fully Automatic 4-Station Pad Printer for Plastic, Metal, Text, Patterns, and Logos
$500.00
Custom Solid Wood Plaque, Antique-Style Wooden Sign with Engraving, Shop Signboard, Couplet, Carved Wood Plaque
$17.00
No-Drill Over-Toilet Storage Rack for Bathroom Wall Gap Behind Tank
$24.55
Upgraded Breakfast Food Warmer Display Cabinet - For Fried Chicken, Pies, Roasted Meat, with Crisp Preservation and Constant Temperature Control
$4,920.00
Butterfly Silicone Mold for Handmade Soap, Fondant, Chocolate, and Ice Cream
$14.00
Professional Music Services: Harmony Arrangement, Vocal Recording, Sheet Music, Mixing & Campus Orchestration
$20.00
Chunfei Grocery Store Yunan GR02 Gravel Bike Thru-Axle Disc Brake Light Load V Travel Many Rack Mounts
$6,445.00
![Pad Printing Silicone Head Mold with Blister Cover, Long Crystal Mold for Pad Printing Machines [Long Strip]](https://www.gosteppe.com/cache/small/product/270328/legacy-main-ca45adf23667d6b16fd9f3c4.webp)
Pad Printing Silicone Head Mold with Blister Cover, Long Crystal Mold for Pad Printing Machines [Long Strip]
$5.00
Remote-Controlled Automatic Fog Cannon for Xinjiang and Inner Mongolia Mines - Explosion-Proof, Anti-Freeze, Noise-Reducing Dust Suppression Sprayer for Coal Yards
$6,000.00
UV Glue for Bonding PET to Melamine Board, PC to Melamine Veneer, Invisible Adhesive for Glass Sliding Doors with UV Curing
$326.00
![[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)
