The Casio FX-991CW is the new upgraded version of the FX-991EX
- LCD display.
- 9 variable memories.
- Non-stick keys.
- 16 + 10 + 2 -digit display.
- Auto shut-off.
- 540 functions.
- Recurring decimals.
- Prime factorization.
- Algebraic logic.
- Regression analysis.
- Statistical functions.
- Hyperbolic.
- 24 levels of parenthesis.
- Metric.
- Dual power source - Solar Power with battery backup.
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