--- product_id: 653538830 title: "OA-991EX Scientific Calculator 552 Functions 2-Line Written Display" brand: "dupota" price: "595492₫" currency: VND in_stock: true category: "Dupota" url: https://www.desertcart.vn/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display store_origin: VN region: Vietnam --- # Quad-core processor for speed Multi-line high-res display 552 functions for every calculation OA-991EX Scientific Calculator 552 Functions 2-Line Written Display **Brand:** dupota **Price:** 595492₫ **Availability:** ✅ In Stock ## Summary > 🔍 Calculate smarter, faster, and with style — don’t get left behind! ## Quick Answers - **What is this?** OA-991EX Scientific Calculator 552 Functions 2-Line Written Display by dupota - **How much does it cost?** 595492₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display) ## Best For - dupota enthusiasts ## Why This Product - Trusted dupota brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **See Every Step Clearly:** High-resolution multi-line display shows formulas and results simultaneously for intuitive understanding. - • **Work at Lightning Speed:** Quad-core processor accelerates matrix and high-order equation calculations, saving you valuable time. - • **Built to Endure & Perform:** Dual solar and button battery system with auto shut-off and durable sliding cover ensures reliability in any setting. - • **Master Complex Calculations:** 552 versatile functions from algebra to integration empower your problem-solving prowess. - • **Lightweight Portability Meets Precision:** At just 125g with anti-slip keys and fraction-decimal toggle, it’s your perfect on-the-go calculation companion. ## Overview The OA-991EX Scientific Calculator by DUPOTA offers 552 advanced functions including spreadsheet, matrix, and statistical calculations. Featuring a high-resolution 2-line display for natural formula visualization and a quad-core processor for rapid computation, it combines durability with portability through a dual solar and battery power system and a lightweight design. Ideal for students and professionals tackling complex equations with ease and efficiency. ## Description desertcart.com : DUPOTA OA-991EX Scientific Calculator 552 Functions 2-Line Written Display | Support Fraction and Decimal Point Conversion Solar Battery, Ideal for Middle High School Students and Teachers : Office Products ## Features - 【552 Calculation Functions】Scientific calculators 991ex features 552 functions, including spreadsheet, exponential, matrix calculation, statistics, integration, algebra, complex number calculation, standard deviation, and more, suitable for handling complex equations and statistical data. From beginner to advanced courses, its practicality can meet the needs of various digital fields. - 【High Resolution & Multi-line Display】991ex scientific calculator is equipped with a high-resolution multi-line display that supports natural display of mathematical formulas and fractions, presenting expressions intuitively and showing the calculation process and results simultaneously. Adjust the screen contrast according to your preference for a clear and comfortable experience. - 【High-Efficiency Calculator】Scientific calculators has an integrated spreadsheet mode that supports data input and formula calculation; advanced operations such as 4×4 matrix and vector operations, with a quad-core processor to enhance calculation speed, making it faster to solve high-order equations and perform matrix operations, meeting the needs of efficient calculation. - 【Long Battery Life & Durable】Fraction calculator has a dual power system of solar and button battery for long-lasting operation. It automatically shuts down after 8 minutes of inactivity. Sliding back cover protects the calculator body, making it pressure-resistant and durable, meeting the needs of high-intensity study and outdoor use, providing peace of mind in exam scenarios. - 【Ultra-light & Portable】Advanced scientific calculators is designed to be lightweight (about 125g), suitable for carrying around. The button layout is clear, and the anti-slip material enhances the operation feel. It has various function keys to simplify complex calculations, including a "CHG" button for switching between fractions and decimals, making precise value calculations easy. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D9Q6RK43 | | Best Sellers Rank | #132,657 in Office Products ( See Top 100 in Office Products ) #119 in Scientific Calculators | | Brand | DUPOTA | | Calculator Type | Engineering/Scientific | | Color | black | | Customer Reviews | 4.2 out of 5 stars 42 Reviews | | Display Type | LCD | | Enclosure Material | Plastic | | Item Dimensions L x W | 6.5"L x 3.15"W | | Item Highlight | Support Fraction and Decimal Point Conversion Solar Battery, Ideal for Middle High School Students and Teachers | | Item Weight | 125 g | | Manufacturer | DUPOTA | | Mfr Part Number | OA-991EX PLUS-XY | | Model Name | OA-991EX PLUS | | Model Number | OA-991EX PLUS | | Number of Batteries | 1 LR44 batteries required. (included) | | Number of Items | 1 | | Power Source | Solar Powered | | Screen Size | 2.5 inches | | UPC | 726434206879 | ## Product Details - **Brand:** DUPOTA - **Calculator Type:** Engineering/Scientific - **Color:** black - **Power Source:** Solar Powered - **Screen Size:** 2.5 inches ## Images ![OA-991EX Scientific Calculator 552 Functions 2-Line Written Display - Image 1](https://m.media-amazon.com/images/I/71edBbg+O4L.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - DUPOTA 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 - Desk Calculator 12 Digit Extra Large LCD Display, Touch Comfortable with Big Buttons, PXY Two Way Power Battery and Solar Standard Function Office Calculators - Desktop Calculator Extra Large 5in LCD Display 12-Digit Big Button Giant Accounting Calculator, Battery & Solar Powered, for Office Business & Home(OS-6815) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display](https://www.desertcart.vn/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-09-25*