The Casio fx-991ES Plus 2 is an updated version of a classic scientific tool, featuring a contemporary, matte-textured chassis. It uses the "Natural V.P.A.M." display, which allows fractions, derivatives, and other math symbols to be shown exactly as they are found in textbooks. This model includes 417 functions, providing deep support for both high school and college-level mathematics.
The housing is made from reinforced ABS plastic, which provides a sturdy feel and resistance to daily wear. It uses a dual power system, combining a solar cell for primary use in well-lit rooms with an LR44 battery for low-light situations. The keypad is designed with high-contrast printing, and the unit includes an updated hard-cover slip-on mechanism for improved protection during transport.
Reliability Features
- Hybrid power system helps monitor and maintain functionality in varied lighting conditions.
- Equation solver utilizes standard algorithms for finding solutions to non-linear equations.
- Reinforced chassis and matte finish help minimize the appearance of surface scratches.
The dual power system is designed to handle the primary load whenever light levels are above 50 lux, which helps preserve the internal battery. While this model does not include spreadsheet functions, its reliability in solving complex integrals and matrices makes it a staple for many students. For storage, the hard cover provides a secure 13.8mm depth to protect the display from pressure.
For students needing even faster processing and modern QR code features, the ClassWiz series is a high-performance alternative.
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