Sharp EL-520XTBBK Scientific Calculator

10-digit scientific calculator with a two-line display performs 419 functions, 52 physical constants and 44 unit conversions to help you quickly work through a wide variety of problems. Dual-power design runs on both solar energy and battery power to ensure consistent, reliable performance no matter where you are. The home key allows you to quickly start fresh from any screen. Scientific calculator is perfect for pre-algebra, algebra, statistics, chemistry and more.