- Home Page /
- Office Products /
- Office Electronics /
- Office Calculator /
- Scientific /
- OA-991EX Plus Scientific Calculator 552 Funct...
0 ratings
Item #:
90617567
OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and
Item #:
90617567
BWP 409
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
0 ratings
Write a review
In stock
Imported from USA store
Order now and get it around Monday, July 27
Secured transaction
Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.
Our Top Logistics Partners
Complies with STEM-approved standards with exam-mode features that disable advanced functions—trusted by educators for standardized test prep.
Fast
Shipping
Free
Return*
Secure Packaging
100% Original Products
PCI DSS Compliance
ISO 27001 Certified
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Natural Formula Display
Visualize complex formulas effortlessly with the natural display feature, enhancing understanding and learning for students and teachers alike.
Dual Power System
Utilizes both solar and battery power to ensure reliability and longevity, making it ideal for extensive use in classrooms and beyond.
Lightweight Design
Designed for portability, the lightweight structure makes it easy for students to carry in backpacks, ensuring they always have the tools they need for success.
Product Details
| Calculator Type | Engineering/Scientific |
| Power Source | Solar Powered |
| Screen Size | 2.5 Inches (6.4 cm) |
| Number of Batteries | 1 LR44 batteries required. (included) |
| Display Type | LCD |
| Color | black |
| Enclosure Material | Plastic |
| Item Dimensions L x W | 6.5"L x 3.15"W (16.5 cm) |
| Brand | DUPOTA |
| Model Name | OA-991EX PLUS |
| UPC | 726434206879 |
| Manufacturer | DUPOTA CO.,LTD. |
| Mfr Part Number | OA-991EX PLUS-XY |
| Model Number | OA-991EX PLUS |
| Item Weight | 125 Grams |
Dangerous Goods
To avoid the delay in customs clearance process for Dangerous Goods, the shipment shall be opened at our warehouse facility to check the severity of hazardous components. Please see the list of Dangerous goods here.
Who Should Buy?
-
High School Students
Ideal for students needing advanced calculations and formula visualization for subjects like math, physics, and chemistry.
-
Teachers
Useful for educators demonstrating complex equations and concepts in a clear, visual format during lessons.
-
STEM Enthusiasts
Great for individuals engaged in science, technology, engineering, or math, requiring extensive functions for diverse calculations.
-
Casual Users
Not ideal for those who only need basic calculations or infrequent usage of advanced mathematical functions.
Product Description
OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What types of functions does the OA-991EX Plus Scientific Calculator support?
Answer: The OA-991EX Plus supports 552 functions including basic arithmetic, trigonometric functions, statistical calculations, and advanced mathematical operations like calculus and complex number calculations. This extensive range of functions makes it ideal for middle and high school students tackling various math subjects such as algebra, geometry, and statistics. Whether you're solving equations or graphing functions, it can accommodate a wide range of educational needs. -
Question:
Is the display on the OA-991EX Plus easy to read?
Answer: Yes, the OA-991EX Plus features a 2-line display that can show up to 102 digits, making it easy to read and follow calculations. This dual-line layout allows users to see the input and results simultaneously, reducing errors and enhancing learning. Students benefit from the clarity, particularly when working on complex equations where visibility matters. -
Question:
What power sources does the OA-991EX Plus use?
Answer: The OA-991EX Plus operates on both solar power and a battery backup, ensuring it remains functional in various lighting conditions. The solar panel serves as the primary power source, while the battery acts as a backup for low light situations, making it reliable for outdoor or dimly lit study environments. This dual-source feature is particularly advantageous for students who may study in varying locations. -
Question:
How does the OA-991EX Plus help with statistics?
Answer: The OA-991EX Plus includes specialized functions for statistical calculations, such as mean, median, variance, and standard deviation. These capabilities help students analyze data sets effectively, making it an essential tool in subjects like statistics and data analysis. This is especially useful when presenting data for class projects or preparing for exams, where understanding data trends is crucial. -
Question:
Is the OA-991EX Plus suitable for advanced math courses?
Answer: Absolutely, the OA-991EX Plus is designed to accommodate advanced math courses, including calculus and higher-level algebra. With its ability to perform complex calculations and graph equations, it supports learning for students aiming for higher education in STEM fields. Students preparing for standardized tests or advanced classes will find it an invaluable asset. -
Question:
What educational level is the OA-991EX Plus best suited for?
Answer: The OA-991EX Plus is ideal for middle to high school students. Its extensive functionalities cater to students who require robust tools for their math and science classes. As students progress through their education, the calculator grows with them, supporting increasingly complex topics encountered in secondary education. -
Question:
Can the OA-991EX Plus handle complex numbers?
Answer: Yes, the OA-991EX Plus can perform calculations involving complex numbers. This is beneficial for students studying advanced mathematics or engineering disciplines where complex number operations are prevalent. By enabling operations such as addition, subtraction, and multiplication of complex numbers, it prepares students for higher education concepts. -
Question:
Does the OA-991EX Plus have graphing capabilities?
Answer: The OA-991EX Plus does not feature advanced graphing capabilities like some graphing calculators; however, it can still handle basic graphing functions. Users can plot simple functions and visualize mathematical relationships. This feature aids students in grasping core concepts in precalculus and trigonometry. -
Question:
What advantages does the solar-powered aspect of the OA-991EX Plus provide?
Answer: The solar-powered feature of the OA-991EX Plus reduces the need for battery replacements, thus offering convenience and environmental benefits. Students can use it without worrying about running out of power during study sessions, ensuring that their learning experience is uninterrupted, regardless of where they study. -
Question:
Where can I buy the OA-991EX Plus Scientific Calculator in Botswana?
Answer: You can purchase the OA-991EX Plus Scientific Calculator at Ubuy in Botswana. Ubuy provides a convenient online shopping experience, allowing you to check availability, make purchases, and access detailed product information from the comfort of your home.
DUPOTA Scientific OA-991EX PLUS Editorial Review
** OA-991ES Plus Scientific Calculator** The OA-991ES Plus Scientific Calculator has garnered a positive reception from students and educators alike, lauded for its extensive functionality and durability. With an impressive repertoire of 552 functions, it caters to a wide spectrum of mathematical needs, from basic arithmetic to complex calculus and statistical calculations. Users find it particularly beneficial for its ability to display calculations in two lines, allowing for a clear view of both the input and the output, which proves essential during examinations and homework. Transitioning from other brands can pose a small learning curve; however, many users appreciate the advanced features that are available at an affordable price point. Those coming from high-end calculators, like HP models, noted a surprising equivalence in functionality, albeit at a fraction of the cost. Additionally, the incorporation of solar power alongside battery backup alleviates concerns regarding energy Consumption, enhancing its practicality for everyday use in academic settings. Despite its strengths, some users have highlighted a few challenges, such as its tendency to provide answers in fraction form, which may be inconvenient during tests. Moreover, while it is packed with numerous features, the absence of specific financial calculations may limit its utility for certain professional applications. Overall, the OA-991ES Plus emerges as a robust academic tool, ideal for middle and high school students and valued by teachers for its reliability and versatility. **
Customer Reviews & Ratings
1 customers ratings
-
5 Star
100%
-
4 Star
0%
-
3 Star
0%
-
2 Star
0%
-
1 Star
0%
Review this product
Share your thoughts with other customers
Pros
- Comprehensive range of 552 functions, covering basic to advanced mathematics.
- Two-line display for clear visibility of calculations.
- Reliable solar and battery operation, reducing the need for frequent battery changes.
- Lightweight yet durable design makes it ideal for school use.
- Affordable alternative to more expensive scientific calculators.
Cons
- Initial learning curve for users transitioning from other brands.
Platform Trust & Buyer Confidence
MT
Mohd
Verified buyer
“The product received very good packaging & safe…Thank You”
16 June 2026 · via Trustpilot
SJ
Shawati
Verified buyer
“Accurate delivery timing given”
16 June 2026 · via Trustpilot
YB
Youcef
Verified buyer
“Not madly expensive like I thought, and much quicker than promised.”
15 June 2026 · via Trustpilot
LM
Leila
Verified buyer
“Never dealt with Ubuy before, but everything worked out great. Seamless cross border purchasing and shipping. Thanks!”
6/7/2026 · via Trustpilot
KA
Kwame
Verified buyer
“The process was smooth, with clear communication and timelines. This was my 1st purchase and I am really impressed. I will definitely be coming back.”
12 June 2026 · via Trustpilot
Secure Checkout
Global Delivery
Easy Returns
Genuine Products
Product Price History
Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
- Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.
BWP 409
Order now and get it around Monday, July 27
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Secured transaction
PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.
Our Top Logistics Partners
Fastest cross-border delivery
Features & Benefits
- Compliant with STEM-approved standards for standardized test preparation.
- Includes anti-cheating features and clear exam-mode instructions.
- Offers 417 calculation functions tailored for STEM curricula.
- Shock-resistant design with a triple-layer protective case.
- Dual power sources enhance energy efficiency for daily use.
- Ergonomic design reduces neck strain, simplifying complex calculations.
Ubuy Assurance
Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.