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The Deli ED991ES Scientific Calculator handles complex trigonometry and statistical calculations with 417 pre-programmed functions. Under the 12-digit LCD, a dual power system uses solar energy and a backup battery. With the Natural Textbook Display, fractions and logarithms appear exactly like paper-based math. This model upgrades the 240 functions of the D82MS to 417 and replaces the old 2-line screen with a full natural display.
Key Features
- 417 Scientific Functions: Includes regression analysis and fractional arithmetic. Processes everything from basic sums to complex engineering equations.
- Dual Power Supply: Solar and battery cell configuration. Keeps the device running during load shedding or low-light study sessions.
- Textbook LCD Display: High-resolution screen rendering natural math notation. Stops errors caused by misreading nested fractions or exponents.
- Matrix and Vector Solver: Dedicated modes for multi-variable linear algebra. Reduces time spent on multi-step manual calculations.
- Sliding Hard Case: 162x82x18 mm plastic protective shell. Protects the buttons and screen from heavy road dust or bag pressure.
- 2-Year Warranty: 24-month coverage for internal hardware defects. Provides a hardware fallback if the internal circuitry fails under normal conditions.
Frequently Asked Questions
Is Deli ED991ES allowed in board exams?
Most BD education boards permit non-programmable scientific calculators without text-storing memory. This model lacks alphanumeric storage, making it acceptable for HSC and university exams.
How many functions does Deli ED991ES have?
The calculator comes with 417 built-in scientific functions. These include advanced matrix calculations, vector analysis, and regression math.
