| Brand | amazon basics |
| Colour | black |
| Calculator Type | Engineering/Scientific |
| Model Name | 991ES Plus |
| Product Dimensions | 16L x 8W Centimeters |
About this item
- 417 Advanced Scientific Functions: Equipped with 417 built-in calculation functions including trigonometry, logarithms, exponentials, calculus, statistics, algebra, complex numbers, matrices, and vectors—ideal for students, engineers, and professionals.
- Large Four-Line Natural Text Display: Features a large four-line screen with natural textbook-style display, allowing formulas and results to appear exactly as written, making complex calculations easier to read and understand.
- Dual Power – Solar & Battery Operated: Powered by both a solar panel and a long-lasting battery for reliable use indoors and outdoors, reducing battery replacement frequency and ensuring uninterrupted performance.
- 10-Digit Mantissa + 2-Digit Exponent: High-precision display supports accurate calculations with a 10-digit mantissa and 2-digit exponent, suitable for advanced scientific and engineering computations.
- Multi-Functional Scientific Keyboard: Ergonomically designed keyboard with dedicated scientific symbols and function keys for fast, efficient input and seamless operation across multiple calculation modes.

