CASIO FX 991 ES PLUS 2E

- Natural display
- 417 available functions
- Equation solver
- Dual power supply

Display

- Display type: 31 96 Dot matrix display
- Natural display
- Algebraic input logic: Natural V.P.A.M.
- Number of characters / lines: 16/1 + 10/1
- Report function: 10 + 2

Memory

- Operation repeat function
- Variable memory: 9

Operations

- 417 available functions
- 40 scientific constants
- 40 metric converters
- Console levels: 24
- Fraction calculations
- Angle sizes DEG / RAD / GRAD
- Conversions between > DEG /> RAD /> GRAD
- Coordinate transformation Pol ÷ Rec
- The trigonometric functions are sin / cos / tan / sin-1 / cos-1 / tan-1
- The hyperbolic functions are sinh / cosh / tanh / sinh-1 / cosh-1 / tanh-1
- Exponent, log, In, 10x, ex
- Mathematical functions √, x2, x-1, 1 / x, x!, Xy, x1 / y
- Calculations based on N (hexadecimal / decimal / binary / octal)
- Logical operators (AND / OR / etc.)
- Calculations in the sexagesimal system
- Percentage calculations
- Technical designation ENG / ENG
- Calculation of complex numbers
- Random number generator
- Value board
- Matrix calculation / vector calculation
- Calculation of equations
- Calculation with complex numbers
- Calc key (temporary formula memory)
- New equation mode
- Function table
- Differential integral calculus
- Numerical integral calculation
- Numerical differential calculus

Statistics

- summation of ∑x, ∑x2
- Summation of ∑x, ∑y, ∑x2, ∑y2, ∑xy
- Standard deviations of grouped and ungrouped values
- Regression analysis
- Permutations (nPr) and combinatorics (nCr)

Other

- Hard case
- Automatic shutdown
- Energy supply: Solar + battery
- Battery type: 1 x LR-44
- Size (L x W x H mm): 11 x 77 x 162
- Weight: 95 g