Casio fx-991EX ClassWiz Scientific Calculator – High-Resolution Display (552 Functions, Spreadsheet, Two-Way Power)

Power through the most demanding STEM subjects with the Casio fx-991EX ClassWiz Scientific Calculator. As the flagship model of Casio’s ClassWiz series, it features an advanced high-resolution LCD (192 × 63 pixels)—delivering 4x the resolution of previous models for razor-sharp graphs, matrices, and textbook-style mathematical formulas.
Packed with 552 built-in functions, the fx-991EX introduces basic spreadsheet calculation capabilities, 4×4 matrix computations, 4th-degree polynomial equations, simultaneous equation solving with up to four unknowns, ratio calculations, and advanced statistical distributions. An intuitive, icon-driven menu display simplifies mode selection, while Two-Way Power (Solar + Battery backup) guarantees continuous operation during high-stakes exams, lab sessions, and lectures.
Finished in an executive black carbon-fiber textured faceplate with a sleek white back and sliding protective cover, it is the premier choice for O/A Levels, FSc, undergraduate engineering, computer science, and business mathematics students.
Key Features

• High-Resolution ClassWiz Display: Features a 192 × 63 pixel screen (4x higher resolution than standard ES PLUS series) that displays fractions, symbols, and formulas exactly as printed in textbooks.
  
• 552 Comprehensive Functions: Fully loaded with differential/integral calculus, 4×4 matrix calculations, vector operations, complex numbers, and advanced probability distributions.
  
• Built-In Spreadsheet Function: Perform multi-row, multi-column spreadsheet calculations (up to 5 columns × 45 rows) directly on the calculator—ideal for statistics and financial math.
  
• Intuitive Icon-Driven Menu: Visual graphic icons replace traditional text menus for fast, effortless mode switching without memorizing abbreviations.
  
• High-Speed Processor: Delivers rapid computation speeds, processing complex integrals, large matrices, and equation roots in seconds.
  
• Two-Way Power (Solar + Battery): Solar-powered in lit environments with an automatic battery backup to ensure uninterrupted exam performance.
  
• Premium Carbon-Pattern Design: Features a stylish textured carbon-fiber look with metallic navigation keys and a reversible slide-on protective hard case.
  

Specifications

• Brand: Casio
  
• Model: fx-991EX (ClassWiz Series)
  
• Product Type: Advanced Non-Programmable Scientific Calculator
  
• Total Functions: 552 Functions
  
• Screen: High-Resolution Dot Matrix Display (192 × 63 dots)
  
• Power Source: Two-Way Power (Solar Cell + 1 x LR44 Button Cell Battery)
  
• Memory: 9 Variable Memories + Independent Memory
  
• Color / Finish: Black Carbon-Fiber Pattern with White Rear Body & Sliding Hard Case
  
• Included Accessories: Slide-on protective hard cover
  
• Target Audience: Engineering, Mathematics, Science, Pre-Engineering, and Business / Finance students