Casio fx-991ES PLUS 2nd Edition Scientific Calculator – Natural Textbook Display (417 Functions, Two-Way Power)

Master advanced mathematics, engineering calculations, and science curricula with the redesigned Casio fx-991ES PLUS 2nd Edition Scientific Calculator. Featuring a modern, ergonomic matte black finish with textured cursor keys and wear-resistant key printing, the 2nd Edition delivers enhanced tactile grip and long-lasting durability for daily classroom, exam, and laboratory use.
Equipped with Casio’s authentic Natural-V.P.A.M. (Natural Textbook Display), mathematical formulas, fractions, roots, powers, and calculus integrals are displayed on-screen exactly as they appear in standard textbooks. With 417 built-in functions—including matrix/vector operations, numerical integration, differential calculus, complex numbers, equation solving, and 40 metric conversions—it is the ideal, curriculum-standard calculator for high school (Matric/FSc/O & A Levels), engineering colleges, and universities. Powered by Two-Way Power (Solar + Battery backup), it guarantees non-stop reliability throughout long study sessions and exams.
Key Features

• Natural Textbook Display (Natural-V.P.A.M.): Shows inputs and results—including square roots, fractions, and integrals—in standard textbook notation for easier comprehension.
  
• 417 Advanced Functions: Covers numerical integration, differentiation, matrix/vector calculations, complex numbers, CALC/SOLVE equations, and base-n operations.
  
• Modern 2nd Edition Redesign: Features a sleek matte black rounded body, rectangular keys, and textured metallic navigation keys for improved typing speed and comfort.
  
• Two-Way Power (Solar + Battery Backup): Solar cell operation in illuminated settings paired with an LR44 battery backup ensures you never run out of power during tests.
  
• High-Resolution Dot Matrix Display: 10-digit mantissa + 2-digit exponential display delivers clear formula legibility.
  
• Statistics & Conversion Tools: Includes list-based STAT editor for standard deviation and regression analysis, plus 40 scientific constants and 40 metric conversion pairs.
  
• Multi-Directional Hard Case: Comes with a durable slide-on protective hard case that attaches and detaches from any direction.
  

Specifications

• Brand: Casio
  
• Model: fx-991ES PLUS (2nd Edition)
  
• Product Type: Non-Programmable Scientific Calculator
  
• Total Functions: 417 Functions
  
• Display Type: Natural-V.P.A.M. Dot Matrix (10 + 2 Digits)
  
• Power Source: Solar & Battery (1 x LR44 Button Cell)
  
• Color / Finish: Matte Black Body with Metallic Navigation D-Pad
  
• Variables / Memory: 9 Variable Memories
  
• Dimensions & Weight: 161.5 × 77 × 11.1 mm | Approx. 95 g
  
• Included Case: Reversible slide-on hard cover