This scientific calculator from CTIFREE is perfect for students, professionals, and engineers. It has a large, easy-to-read 12-digit LCD that displays 2 lines of 14 characters each. The FX-991MS has a high-definition LCD that displays more calculation results, reducing the need for scrolling. Its perfect for classrooms, offices, exams, and business. This scientific calculator has a high-precision calculation engine that can accurately calculate 12-digit calculations with up to 16 decimal places. It can handle 12-digit calculations with up to 16 decimal places, making it perfect for scientific, engineering, and mathematical calculations. Its also great for tax calculations, loan interest calculations, and other financial calculations. The FX-991MS has a powerful memory that can store up to 30 sets of calculation results with 12 digits each. The FX-991MS is a versatile scientific calculator equipped with a two-line display for simultaneous input and output visibility. Boasting a myriad of functions, it supports basic arithmetic, trigonometric, logarithmic, and statistical calculations, making it suitable for diverse mathematical and scientific applications. The multi-replay function allows users to review and edit previous calculations seamlessly, while the calculators two-way power system, utilizing both solar power and a single AAA battery, ensures reliable functionality in various lighting conditions. Additional features include support for fraction calculations, complex number operations, matrix and vector calculations, statistical analysis, and engineering notation. The calculators compact design is complemented by a protective slide-on hard case, making the FX-991MS a convenient and portable tool for students, professionals, and anyone requiring advanced mathematical capabilities.