--- product_id: 639197219 title: "Casio fx-991CW Advanced Scientific Calculator, 4-Tone Display" brand: "casio" price: "S$94" currency: SGD in_stock: true url: https://www.desertcart.sg/products/639197219-casio-fx-991cw-advanced-scientific-calculator-4-tone-display store_origin: SG region: Singapore --- # 540+ advanced functions solar powered with battery backup 4-tone high-res display Casio fx-991CW Advanced Scientific Calculator, 4-Tone Display **Brand:** casio **Price:** S$94 **Availability:** ✅ In Stock ## Summary > 📐 Elevate your calculations—where precision meets power. ## Quick Answers - **What is this?** Casio fx-991CW Advanced Scientific Calculator, 4-Tone Display by casio - **How much does it cost?** S$94 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/639197219-casio-fx-991cw-advanced-scientific-calculator-4-tone-display) ## Best For - casio enthusiasts ## Why This Product - Trusted casio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **QR Code Graphing:** Instantly visualize results by scanning QR codes to ClassPad.net—next-level study sessions. - • **Memory & Math Catalog:** Store up to 9 variables and access 87 constants & conversions for seamless workflow. - • **540+ Advanced Functions:** From numeric integration to 4x4 matrix operations, tackle complex problems effortlessly. - • **Natural Textbook Display:** See equations exactly as in your textbooks—no more guesswork or errors. - • **Durable & Ergonomic Design:** Rounded keys and non-slip case built for intense exam conditions and daily use. ## Overview The Casio fx-991CW is a solar-powered advanced scientific calculator featuring a crisp 4-tone high-resolution display and over 540 functions including numeric calculus, matrix operations, and vector calculations. Designed for students and professionals, it offers a natural textbook display, memory storage for variables, and QR code functionality for graphing on ClassPad.net, all housed in a durable, ergonomic design ideal for exams and daily use. ## Description A high performance scientific calculator with high resolution display increasing the amount of information displayed and super fast calculation speed for testing or performing the most advance mathematics. High resolution LCD screen allows viewing of more information like spreadsheets and 4x4 matrix calculations. This calculator has a comprehensive set of advanced calculations for integration & differential calculus, along with vector and inequality calculations. For middle school, high school and college math courses. ## Features - NATURAL TEXTBOOK DISPLAY – View equations, fractions, and symbols exactly as they appear in textbooks for better comprehension and reduced errors. - HIGH-RESOLUTION 4-TONE DISPLAY – Enhanced screen with quad-tone shading improves visibility and makes cursor tracking easy when writing and editing expressions. - MEMORY & MATH CATALOG – Store and recall up to 9 variables containing integers, computations, and functions. Memory persists between sessions—an educator-requested feature. Access 47 constants, 40 conversions, advanced math functions, and more through the intuitive Math Catalog. - 540 ADVANCED FUNCTIONS – Perform numeric integration and differentiation, 4x4 matrix operations, spreadsheet-style data viewing, and more. - QR FUNCTIONALITY & DURABLE DESIGN – Scan QR codes to graph results on ClassPad.net; includes rounded keys and a non-slip hard case for classroom or exam use. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BSJ33C4R | | Best Sellers Rank | #76,628 in Office Products ( See Top 100 in Office Products ) #80 in Scientific Calculators | | Brand | Casio | | Calculator Type | Engineering/Scientific | | Color | Black | | Customer Reviews | 4.7 4.7 out of 5 stars (2,216) | | Display Type | LCD | | Enclosure Material | Plastic | | Item Dimensions L x W | 6.3"L x 3"W | | Item Highlight | 540+ functions, numeric calculus, matrix solver; ideal for engineering, science & exams | | Item Type Name | Casio Advanced Scientific Calculator | | Item Weight | 3.35 ounces | | Manufacturer | Casio | | Mfr Part Number | FX-991EX | | Model Name | FX-991CW | | Model Number | FX-991CW | | Number of Batteries | 1 LR44 batteries required. (included) | | Number of Items | 1 | | Power Source | Solar Powered | | Screen Size | 2.25 inches | | UPC | 889232615011 | | Unit Count | 1 Count | | Warranty Description | 1 year limited manufacturer | ## Product Details - **Brand:** Casio - **Calculator Type:** Engineering/Scientific - **Color:** Black - **Power Source:** Solar Powered - **Screen Size:** 2.25 inches ## Images ![Casio fx-991CW Advanced Scientific Calculator, 4-Tone Display - Image 1](https://m.media-amazon.com/images/I/716Qoq3t58L.jpg) ## Questions & Answers **Q: Can it handle complex numbers in matrix ?** A: Yes. .or say within reason. Download the manual from Casio, its free and you dont need to buy calculator.. Look at page 114 and 107. Make sure you download fx-991CW...not fx-991. **Q: ¿Este artículo tiene garantía?** A: Good afternoon, I bought the calculators without a guarantee, but I really don't know if the product has a guarantee, although they should have a guarantee. Regards, AC. **Q: when you turn off the calculator, the calculation history is deleted or not?** A: The data is deleted when you turn it off. It's the only thing that keeps it from being the perfect scientific calculator for me. **Q: is there a ohms law calculator?** A: Well any calculator can "do" Ohms law. If ypur worried about remembering it, any programming calculator can store formulas for you...Calculated Industries (yellow calculators) makes 2 Electrical calculators, pretty sure both have Ohms law function key. ## Frequently Bought Together - Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams - Texas Instruments TI-36X Pro Engineering/Scientific Calculator | 9.7 Inch | Black. --- ## 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.sg/products/639197219-casio-fx-991cw-advanced-scientific-calculator-4-tone-display](https://www.desertcart.sg/products/639197219-casio-fx-991cw-advanced-scientific-calculator-4-tone-display) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-09-27*