Negotiable

                                            Casio fx-991ES PLUS Scientific Calculator (Thailand Edition)

- Type: Non-programmable, non-graphing scientific calculator  
- Functions: 417 built-in functions covering mathematics, engineering, and science  
- Display:  
  - 10 + 2 digit LCD (Liquid Crystal Display)  
  - Natural Textbook Display (shows fractions, roots, and equations as they appear in textbooks)  
  - Dot-matrix screen for clear readability  

- Key Features:  
  - Plastic keys with fast-typing support (2-key rollover)  
  - 9 independent memory variables  
  - Answer memory and memory protection  
  - Reset function  
  - Auto power-off for energy saving  

- Power Supply: Dual (Solar + Battery)  
  - Approximate battery life: 3 years  

- Accessories: Comes with a hard protective case  

- Calculation Capabilities:  
  - Basic arithmetic and bracket calculations  
  - Fractions and sexagesimal (degree, minute, second) calculations  
  - Trigonometric, logarithmic, exponential functions  
  - Statistical calculations (standard deviation, regression, probability)  
  - Complex numbers, matrices, and vector calculations  
  - Equation solving and integration/differentiation  

- Dimensions: Approx. 161.5 × 77 × 11.1 mm  
- Origin: Manufactured in Thailand  

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This model is widely used by students and professionals because of its versatility, durability, and exam-appropriate non-programmable design.                                    

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