--- product_id: 653538830 title: "OA-991EX Scientific Calculator 552 Functions 2-Line Written Display" brand: "dupota" price: "4945 kr" currency: ISK in_stock: true reviews_count: 9 category: "Dupota" url: https://www.desertcart.is/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display store_origin: IS region: Iceland --- # 4x4 matrix & spreadsheet mode 552 versatile functions dual solar & battery power OA-991EX Scientific Calculator 552 Functions 2-Line Written Display **Brand:** dupota **Price:** 4945 kr **Availability:** ✅ In Stock ## Summary > 📈 Elevate your calculations — never miss a beat with OA-991EX! ## Quick Answers - **What is this?** OA-991EX Scientific Calculator 552 Functions 2-Line Written Display by dupota - **How much does it cost?** 4945 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/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 - • **Lightweight & Ergonomic:** At just 125g with anti-slip keys and a smart CHG button, it’s designed for seamless portability and precision on the go. - • **Blazing Fast Performance:** Quad-core processor accelerates matrix and vector operations, saving you valuable time on complex problems. - • **Built to Endure & Perform:** Dual power system with solar + button battery and a durable sliding cover ensures reliability during intense study sessions or outdoor use. - • **Master Complex Calculations:** 552 built-in functions from algebra to integration, perfect for advanced coursework and professional use. - • **Crystal-Clear Multi-Line Display:** High-resolution 2-line screen shows formulas and results simultaneously for intuitive, error-free calculations. ## Overview The OA-991EX Scientific Calculator packs 552 advanced functions including statistics, matrix, and algebra into a sleek, lightweight design. Featuring a high-resolution 2-line display and a quad-core processor, it delivers fast, accurate results with intuitive formula visualization. Dual solar and battery power plus a durable sliding cover ensure long-lasting reliability, making it the ideal tool for students and professionals tackling complex calculations. ## 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 Review: Amizon - My niece needed this for college and loved it Review: Great price - I loved this calculator. While this is not a Casio brand, it’s nearly identical and can be used with Casio tutorial videos on YouTube. The price is unmatched. A calculator like this can go for $30 and up so this is a huge plus. For anyone looking to do STATS, this calculator has probability functions like Normal, Poisson, and Binomial distributions. ## 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 | #135,870 in Office Products ( See Top 100 in Office Products ) #127 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 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) ![OA-991EX Scientific Calculator 552 Functions 2-Line Written Display - Image 2](https://m.media-amazon.com/images/I/71e9Q9UdQ6L.jpg) ![OA-991EX Scientific Calculator 552 Functions 2-Line Written Display - Image 3](https://m.media-amazon.com/images/I/71XyU1pojNL.jpg) ![OA-991EX Scientific Calculator 552 Functions 2-Line Written Display - Image 4](https://m.media-amazon.com/images/I/71EXmeTmg-L.jpg) ![OA-991EX Scientific Calculator 552 Functions 2-Line Written Display - Image 5](https://m.media-amazon.com/images/I/71onpB6B8vL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Amizon *by M***W on September 11, 2025* My niece needed this for college and loved it ### ⭐⭐⭐⭐ Great price *by M***M on July 26, 2026* I loved this calculator. While this is not a Casio brand, it’s nearly identical and can be used with Casio tutorial videos on YouTube. The price is unmatched. A calculator like this can go for $30 and up so this is a huge plus. For anyone looking to do STATS, this calculator has probability functions like Normal, Poisson, and Binomial distributions. ### ⭐⭐⭐⭐⭐ Buen Artículo *by J***Z on April 16, 2025* Excelente ## 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.is/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display](https://www.desertcart.is/products/653538830-oa-991ex-scientific-calculator-552-functions-2-line-written-display) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-09-13*