The Casio FX-991EX Classwiz Scientific Calculator is a handheld device suitable for Advanced A-Levels and GCSE students. Featuring a regular key size and LCD display with backlight, this calculator offers advanced scientific capabilities including calculus functions. Powered by both solar and battery, this Casio model is reliable and efficient for complex calculations on the go. Ideal for academic use, the Casio FX-991EX Classwiz calculator is a trusted tool for students looking to solve challenging mathematical problems.