The Casio fx-300ES PLUS Natural-VPAM 2nd Edition scientific calculator is a handheld device with regular-sized keys and display. Powered by batteries, this calculator is designed for scientific calculations, specifically featuring calculus functions. The Casio brand is known for its reliable and efficient calculators, making this model a trusted choice for office, business, and industrial use. With its tested and working functionality, this calculator is a practical tool for precise mathematical computations.