--- product_id: 644448999 title: "991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display" brand: "catiga" price: "$48.05" currency: USD in_stock: true category: "Catiga" url: https://www.desertcart.us/products/644448999-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery store_origin: US region: United States of America --- # 32% larger high-res display Dual solar & battery power 552 advanced functions 991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display **Brand:** catiga **Price:** $48.05 **Availability:** ✅ In Stock ## Summary > 📊 Elevate your calculations — because precision is the new power move. ## Quick Answers - **What is this?** 991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display by catiga - **How much does it cost?** $48.05 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/644448999-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery) ## Best For - catiga enthusiasts ## Why This Product - Trusted catiga brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unstoppable Power Duo:** Solar plus battery backup ensures your calculator never quits during critical moments. - • **Textbook-Style Display:** Formulas and expressions appear exactly as in textbooks, boosting accuracy and comprehension. - • **Built to Last & Support You:** Durable design with a 365-day warranty and responsive 24-hour customer service. - • **Master Complex Calculations:** 552 functions covering calculus, matrices, statistics & more for every STEM challenge. - • **Visual Clarity on a Big Screen:** Enjoy a 32% larger LCD that shows detailed graphs and multi-line equations simultaneously. ## Overview The CATIGA SS-991EX is a robust scientific calculator featuring 552 advanced functions ideal for high school and college STEM courses. It boasts a 32% larger high-resolution LCD for clear, textbook-style formula display, dual solar and battery power for uninterrupted use, and a durable build backed by a one-year warranty and responsive customer support. ## Description desertcart.com: CATIGA SS-991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display : Office Products ## Features - 552 FUNCTIONS SCIENTIFIC CALCULATOR: Includes spreadsheet, matrix calculations, statistics, calculus, complex number calculations, equation calculations, standard deviation, vector calculations, permutations and combinations. Perfect for Advanced and Beginner courses including Biology, Chemistry, Physics, Finance and Business. - USER FRIENDLY FORMAT: Displays formulas and expressions as they appear in textbooks, simplifying learning and problem-solving. This feature ensures that complex equations are presented in a clear, structured manner, making it easier for users to follow along and verify their work, ultimately enhancing accuracy and understanding in both educational and professional settings. - LARGE HIGH RESOLUTION SCREEN: The high-resolution LCD display is 32% larger than regular two-line calculators, showing intricate details ideal for advanced operations such as spreadsheets and 4x4 matrix calculations. The spacious screen allows graphs and equations to be displayed simultaneously, enhancing the clarity and precision of your work. - DUAL POWER SOURCE: Features both solar power and a battery backup, guaranteeing continuous performance for crucial calculations, making it reliable and efficient for use in any environment. - DURABILITY and QUALITY: Engineered with strong materials, SS-991EX withstands extensive use, providing long-term reliability. If your calculator fails to turn on, try pressing the reset button on the back. For further issues, benefit from our 365-day limited warranty. Contact us, and we'll respond within 24 hours. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D7VJMNJ9 | | Best Sellers Rank | #18,831 in Office Products ( See Top 100 in Office Products ) #20 in Scientific Calculators | | Brand | CATIGA | | Calculator Type | Engineering/Scientific | | Color | 991-EX Black | | Customer Reviews | 4.4 4.4 out of 5 stars (3,774) | | Display Type | LCD | | Enclosure Material | Plastic Or Metal Alloy | | Manufacturer | CATIGA | | Mfr Part Number | SS-991EX | | Model Name | CATIGA SS-991EX | | Power Source | Battery Powered | | Screen Size | 3 Inches | | UPC | 813629025138 813629023745 | ## Product Details - **Brand:** CATIGA - **Calculator Type:** Engineering/Scientific - **Color:** 991-EX Black - **Power Source:** Battery Powered - **Screen Size:** 3 Inches ## Images ![991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display - Image 1](https://m.media-amazon.com/images/I/71VPpk3aloL.jpg) ## Available Options This product comes in different **Color** options. ## Frequently Bought Together - CATIGA SS-991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display - BIC Brite Liner Highlighters, Chisel Tip, 5-Count Pack of Highlighters Assorted Colors, Ideal Highlighter Set for Organizing and Coloring - Amazon Basics Woodcased Classroom #2 Pencils with Erasers, Pre-sharpened, HB Lead, Value Pack of 30 count, Orange --- ## 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.us/products/644448999-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery](https://www.desertcart.us/products/644448999-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-05*