Casio fx-991ES
The Casio fx-991ES (introduced in 2004) is a solar and battery powered scientific calculator from Casio, whose special feature is the natural representation of mathematical expressions and formulas through a 96 × 31 dot matrix LCD display. The system is termed as "Natural Display".
The fx-991ES is no longer manufactured and is succeeded by the fx-991ES Plus (for the international market) which has some improvements over the fx-991ES in inputting fractions and, displaying the results. It also offers more memory stores. Its variant is the Casio fx-570ES Plus, with exactly the same features but powered by a single AAA-size battery.
The system used by the fx-991ES Plus is called "Natural V.P.A.M" instead of Natural Display. Other related models are the fx-995ES (for the Japanese market), fx-991DE Plus (for the German market) and fx-115ES Plus (mainly for the US and Canadian market). These models incorporate many more features than the fx-991ES Plus.
Some of the features of Casio fx-991ES (and fx-991ES PLUS)
- Standard scientific calculations (Trigonometric, Exponential, Logarithmic)
- Complex Number calculations
- Matrix calculations
- Numerical Integration and Differentiation
- Fraction calculations
- Equation solver
- Base-N calculations (Binary, Octal, Decimal Hexadecimal)
- Combination and Permutation
- List-based STAT data editor
- Standard deviation
- Paired-variable statistics regression analysis
- Logical operations
- Table function
- 40 scientific constants
- 40 metric conversions (20 conversion pairs)
- 9 variable memories
- Uses a single LR44 (alakline) button battery (in addition to a solar cell)
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