The Casio FX-991EX Classwiz Scientific Calculator is a handheld device designed for GCSE exams. With 552 functions and features such as an LCD display, backlight, and calculus capabilities, this calculator is ideal for students and professionals alike. Powered by solar energy and batteries, this Casio model is reliable and convenient for on-the-go use. Its regular key size and display make it easy to navigate and read, making it a useful tool for calculations in various settings.