CTIFREE S10 3-in-1 Scientific Calculator | 401 Functions | 10+2 Digit Dual-Line Display | Built-in Erasable Writing Pad | Ideal for Student Exams and Engineering Calculations | Portable Foldable Design

• This innovative 3-in-1 design enables efficient learning and work. It integrates a scientific calculator, erasable writing pad, and stylus, allowing for simultaneous calculation and workarounds without the need for extra scratch paper, significantly improving problem-solving and work efficiency. • 401 Professional Functions Covering All Needs The built-in 401 calculation functions support trigonometric functions, statistical analysis, equation solving, matrix operations, complex number calculations, and more, comprehensively meeting the calculation needs of junior high, high school, and university mathematics, physics, and engineering. • High-Definition Dual-Line Display with Natural Writing Format The 10+2 digit dual-line display supports natural writing format input and output, making formulas and results clear and intuitive, effectively reducing calculation errors and enhancing the learning experience. • Portable and foldable design with long battery life. Measuring only 160×78×15mm, it's slim and portable. Powered by a CR2025/CR1120 button battery, it offers long battery life, making it suitable for classroom use, exams, and mobile office work. • High-quality materials for durability and reliability. The body is made of environmentally friendly ABS material. The buttons are sensitive and comfortable, the writing on the tablet is clear, and it can be repeatedly erased and rewritten. Sturdy and durable, it's an ideal tool for students and professionals.