The Casio FX-991 EX Scientific Calculator is a high-quality handheld device, perfect for students and professionals alike. With a large LCD display and powered by batteries, this calculator is a reliable tool for complex calculations. Made by the reputable brand Casio in Japan, this model (FX-991EX) offers regular-sized keys for ease of use. Its scientific capabilities make it a versatile choice for various mathematical tasks, making it a must-have for anyone in need of a dependable calculator for their office or educational needs.