Casio

This Casio fx-991DE Plus scientific calculator is a great choice for students and professionals who need a reliable and versatile calculator. It features a large, easy-to-read display, a wide range of functions, and a natural display that makes it easy to enter and view equations. The calculator is powered by both solar and battery power, so you can always be confident that it will work when you need it. It also comes with a protective case for added durability. With its comprehensive functionality, the Casio fx-991DE Plus Scientific Calculator allows you to tackle complex mathematical problems with ease. Key features include: * Natural-V.P.A.M. display for intuitive equation input and output * Wide range of functions, including trigonometry, statistics, calculus, and more * Two-way power system (solar and battery) * Protective case for added durability