Features & Benefits
- High-definition LCD display and backlight
- ClassWiz technology for easy calculus
- Dual power source of solar and battery
- Made in China, new and sealed
- Perfect for business and scientific use
- Take your work to the next level
Item #:
79938247
CASIO FX-991EX Advanced Scientific Calculator HD Display CLASSWIZ New Sealed
87% of respondents would recommend this to a friend
Item #:
79938247
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The Casio fx-991EX is the ultimate in scientific calculators.
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What Stands Out
Advanced Functions
Offers over 500 functions including 4x4 matrix calculations, complex number calculations, and calculus capabilities, catering to high school and college students for diverse subjects.
High-Resolution Display
Features a 192 x 63 pixel LCD screen that provides clear, detailed visualizations of equations and graphs, enhancing readability and usability during complex problem-solving.
Interactive Features
Incorporates an intuitive user interface and a natural textbook display for easy input and review of mathematical expressions, making it accessible for learners at all levels.
Product Details
| Item Weight | 1 lbs (450 grams) |
Who Should Buy?
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Students
Ideal for high school and university students needing advanced functions for mathematics, physics, and engineering courses.
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Professionals
Great for engineers and scientists who require precise calculations for research and project work in various fields.
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Exam Candidates
Suitable for students preparing for standardized tests that permit scientific calculators, offering comprehensive calculation features.
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Casual Users
Not necessary for individuals who need basic calculations, as simpler calculators would suffice and be easier to use.
Product Description
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Customer Questions & Answers
-
Question:
What type of display does it have?
Answer: The Casio fx-991EX has a high-definition LCD display with a backlight. -
Question:
Does it have calculus capabilities?
Answer: Yes, it has ClassWiz technology that allows for easy and efficient calculus. -
Question:
What is the power source for this calculator?
Answer: It has a dual power source of solar and battery to ensure you are never caught without power.
Editorial Review
The Casio FX991EX Classwiz Scientific Calculator has received a generally favorable reception from users, highlighting its advanced features and functionality. Many customers appreciate the value it offers, especially during promotional discounts. Users recommend it for its array of capabilities, including variable memory functions, which allow for storing Constants for easy retrieval. With many pre-programmed Constants and the ability to edit formulas post-calculation, the FX991EX simplifies complex computations, making it ideal for students and professionals alike. However, not all feedback has been glowing. Some users have expressed dissatisfaction with its size and ergonomics, preferring the compactness of earlier models like the FX260. The key design has drawn criticism for feeling cheap and producing a rattling sound, along with concerns about the readability of some labels due to the mottled surface. Furthermore, the V.P.A.M. (Visual Programmable Algebraic Method) entry method, which is touted as a principal feature, has been deemed cumbersome by some, as it requires additional clicks compared to more straightforward input methods. Despite these critiques, the FX991EX has been praised for its aesthetic appeal, quick performance compared to competitors, and its harmonious blend of modern design and functionality. To some, it stands as a worthy upgrade in technology with exciting features, such as the QR code generator, enhancing its usability beyond simple calculations. **
Customer Reviews & Ratings
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Pros
- Advanced features and functionality including variable memories and pre-programmed Constants.
- Easy to use with a variety of useful functions.
- Aesthetically pleasing design and faster performance than competing models.
- Capable of editing formulas post-calculation and generating QR codes.
Cons
- Larger size than some users prefer, making it less portable.
Platform Trust & Buyer Confidence
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Ranee
Verified buyer
“Paint ordered from USA, u buy got the product to me in New Zealand in approx a week”
22 July 2026 · via Trustpilot
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NordVPN
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“very speedy delivery,tracking info was superb-best experikence ever!!!”
24 June 2026 · via Trustpilot
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Nicholas
Verified buyer
“Love what I received and ordered found that usa clothes are more better quality and look better than the same clothes in my country but are harder to find here recommend ubuy 100%”
22 June 2026 · via Trustpilot
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Dneah
Verified buyer
“Product came earlier than expected (shipped from US to NZ), in about 3 weeks. No damages and product was exactly as advertised!”
15-Jul-26 · via Trustpilot
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Tania
Verified buyer
“Easy to order, easy to track and the product is great to use. Also, the person-to-person (not automated) phone call I got to confirm that I'd received the item was wonderful ??”
11-Jul-26 · via Trustpilot
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