Casio FX-991MS calculator

The Casio FX-991MS is a non-programmable scientific calculator renowned for its comprehensive functionality and user-friendly design. Below is an overview of its key features and specifications:

Key Features:

• 401 Functions: Supports a wide range of calculations, including fractions, combinations, permutations, statistical analyses (standard deviation, regression), equation solving, differentiation, integration, base-n calculations, and complex number computations.

• S-V.P.A.M. (Super Visually Perfect Algebraic Method): Allows input and display of expressions in a format similar to standard mathematical notation, enhancing usability.

• Two-Line Display: Simultaneously shows the input expression on the top line and the result on the bottom line, facilitating easy verification and correction.

• Multi-Replay Function: Enables quick review and editing of previous entries to streamline complex calculations.

• 9 Variable Memories: Provides storage for multiple variables, aiding in complex problem-solving and iterative calculations.

• Slide-On Hard Case: Offers protection against damage, ensuring durability for daily use.

Specifications:

• Display: 10-digit mantissa plus 2-digit exponential display, accommodating large numbers and scientific notation.

• Power Supply: Dual-powered with a built-in solar cell and a button battery (LR44 × 1), providing approximately three years of use based on one hour of operation per day.

• Dimensions: 155 mm (D) x 78 mm (W) x 13 mm (H), offering a compact and portable design.

• Weight: Approximately 95 grams, including the battery, ensuring lightweight portability.