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DELI Scientific Calculator D991EX – 552-Function Dual-Line Calculator
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Key item features
The DELI Scientific Calculator D991EX is a versatile and high-performance calculator designed for students, engineers, teachers, and professionals who require advanced mathematical computation. Featuring 552 built-in functions, this scientific calculator covers a wide range of operations including algebra, trigonometry, statistics, logarithms, and conversions — making it suitable for classroom learning, homework, exams, and technical applications. Its dual-line textbook-style display allows users to view equations and results simultaneously, enhancing readability and reducing errors during complex calculations.
Constructed with a durable plastic body and responsive keys, the D991EX offers reliability and ease of use for daily tasks. The calculator is powered by both solar energy and battery (typically LR44 batteries), ensuring consistent performance in various lighting conditions. A sliding protective cover keeps the device safe during storage and transportation, while its ergonomic layout makes prolonged use comfortable. Whether you’re tackling advanced problems in mathematics, physics, or engineering, this DELI calculator provides dependable computation and excellent value.
Key Specifications:
Functions: 552 advanced scientific and engineering functions
Display: Dual-line, textbook-style LCD (10+2 digits)
Power: Solar + battery (LR44 or similar)
Protective cover: Sliding cover included
Built-in mathematics: Algebra, trigonometry, statistics, conversions, logs, etc.
Material: Durable plastic body
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About this item
The DELI Scientific Calculator D991EX is a versatile and high-performance calculator designed for students, engineers, teachers, and professionals who require advanced mathematical computation. Featuring 552 built-in functions, this scientific calculator covers a wide range of operations including algebra, trigonometry, statistics, logarithms, and conversions — making it suitable for classroom learning, homework, exams, and technical applications. Its dual-line textbook-style display allows users to view equations and results simultaneously, enhancing readability and reducing errors during complex calculations.
Constructed with a durable plastic body and responsive keys, the D991EX offers reliability and ease of use for daily tasks. The calculator is powered by both solar energy and battery (typically LR44 batteries), ensuring consistent performance in various lighting conditions. A sliding protective cover keeps the device safe during storage and transportation, while its ergonomic layout makes prolonged use comfortable. Whether you’re tackling advanced problems in mathematics, physics, or engineering, this DELI calculator provides dependable computation and excellent value.
Key Specifications:
Functions: 552 advanced scientific and engineering functions
Display: Dual-line, textbook-style LCD (10+2 digits)
Power: Solar + battery (LR44 or similar)
Protective cover: Sliding cover included
Built-in mathematics: Algebra, trigonometry, statistics, conversions, logs, etc.
Material: Durable plastic body
The DELI Scientific Calculator D991EX is a powerful and user-friendly calculator with 552 scientific functions and a clear dual-line display. It’s built for students and professionals who need accurate, high-level computation in math and science. Its combination of durable design, versatile features, and dual power makes it an excellent tool for school, college, and office use.
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Questions & answers
5 answered questions
It offers 552 built-in functions, covering a broad range of scientific and engineering operations.
Yes — the dual-line LCD shows the equation on one line and the result on the other, improving clarity during calculation.
This calculator uses dual power — solar energy and battery (usually LR44 type) to ensure continuous operation in varying light conditions.
Absolutely. Its extensive function set makes it suitable for high school, college, engineering, and general scientific coursework.
Yes — it includes a sliding protective cover that shields the keypad and screen when not in use.
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