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**Product Specifications:**
**Brand:** CASIO
**Model:** CLASSWIZ fx-991CNX#
**Features:**
- Suitable for university and graduate professional course exams
- Recommended for competitions such as Zhou Peiyuan University Mechanics Competition, Physics and Chemistry Competitions
- Recommended for National Physics Competition (2016-2023), China Chemistry Olympiad (2018-2022), Zhou Peiyuan University Mechanics Competition (2021-2030)
**Main Functions:**
- Calculation functions
- Chinese version
- Dual power source
- Solving transcendental equations, matrices, complex calculations
**Display:**
- High-definition LCD screen
- Clear and precise display
**Additional Features:**
- Special sunken power button to prevent accidental touches
- Mathematical format printing on keys for easy operation
- Special surface processing and precision manufacturing for enhanced appearance
**Package Contents:**
- Instruction manual x1
- Button cell battery LR44 x1 (pre-installed in the device)
- Calculator x1
**Product Comparison:**
- Model: fx-991CNX, fx-95CNX, fx-82CNX
**Size and Weight:**
- Dimensions: 11.1 cm x 7.7 cm
- Weight: Approximately 90g (including battery), approximately 100g (including battery)
**Note:** The calculator screen displays in this product detail page are for design purposes only and are for reference.