This Casio FX-991ES Plus scientific calculator is a versatile tool for students, professionals and anyone who needs to crunch numbers quickly and accurately. With its battery/solar power source, you can use it anywhere, anytime. Its regular key size and handheld size make it easy to use and carry around. This model has a range of functions including advanced math, statistics, and engineering capabilities. The brand is well-known for producing high-quality calculators, and this one is no exception. Whether you're studying for an exam, working on a project, or running a business, this calculator will be a valuable addition to your toolkit.