Casio fx-991es Plus-2nd Edition

The Casio fx-991ES Plus 2nd Edition is a scientific calculator with a range of advanced features for both students and professionals. Here are its key specifications:

General Features:

• Display Type: Natural Display (Natural Textbook Display) – displays fractions, square roots, and other mathematical expressions as they appear in textbooks.
• Power Supply: Solar-powered with battery backup (1 x LR44 battery).
• Dimensions: 162 x 80 x 12.1 mm
• Weight: Approximately 100 g.
• Color: Typically black or silver.
• Multi-line Display: Can show up to 4 lines of text, providing a larger display area for calculations.

Calculations & Functions:

• Modes: 40 modes including standard scientific functions, statistics, engineering, matrix, complex number, etc.
• Functions:
  • Basic Operations: Addition, subtraction, multiplication, division.
  • Advanced Functions: Trigonometric (sin, cos, tan, etc.), logarithmic (log, ln, etc.), exponential, powers, and roots.
  • Fraction Calculations: Handles fractions and conversions between fractions and decimals.
  • Matrix Operations: Supports matrix calculations, including determinant and inverse.
  • Equation Solving: Capable of solving equations with one variable, including linear, quadratic, and simultaneous equations.
  • Differentiation & Integration: Can compute derivatives and integrals for given functions.
  • Table Calculations: Ability to create tables of values for functions.
  • Random Number Generation: Built-in random number function.
  • Base-n Calculations: Supports binary, octal, decimal, and hexadecimal calculations.
  • Unit Conversions: Converts between a variety of units (length, mass, time, etc.).
  • Statistical Functions: Statistical analysis, including mean, standard deviation, and regression analysis.

Additional Features:

• Memory: 9 memory slots to store intermediate results or values.
• Table Mode: Allows the display of values in a table form for calculations of specific functions.
• Complex Numbers: Supports complex number calculations with rectangular and polar modes.
• Equation Mode: Capable of solving up to 4x4 simultaneous equations.
• Angle Unit: Option to select degrees, radians, and gradians.
• Multi-replay: Allows you to scroll through previous calculations.

Other Details:

• Durability: A robust design that can withstand regular usage.
• Backlight: No backlight.

The Casio fx-991ES Plus 2nd Edition is ideal for a wide variety of users, from high school students to professionals in fields requiring complex calculations. It is highly regarded for its ease of use, accuracy, and functionality in handling a broad spectrum of mathematical and scientific operations.

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