The Texas Instruments TI-36X Pro is an advanced 4-line scientific calculator designed to handle complex mathematics, engineering, and science coursework. It features the MathPrint display system, which shows expressions and symbols exactly as they appear in textbooks, making it a dependable tool for students and professionals alike. The calculator uses a dual power system, combining solar energy and battery power for steady performance during long study sessions or exams. This unit is in used condition and has been tested to ensure it is in full working order. The calculator includes the protective cover, which helps keep the keys and LCD screen secure during transport. It is suitable for use in various high school and college-level courses, including algebra, geometry, trigonometry, calculus, and physics, as well as for major standardized exams like the SAT, ACT, and AP tests. The device is built with a durable black housing and offers 16-digit precision for engineering and scientific calculations. This calculator is a practical choice for anyone needing a functional, multi-line scientific calculator for advanced problem solving and mathematical computations.