This Casio FX-115ES PLUS Scientific Calculator is a reliable and efficient tool for all your mathematical needs. With its solar and battery power source, it's perfect for on-the-go calculations. This handheld calculator is designed for ease of use and portability, making it an ideal choice for professionals and students alike. Featuring natural UPAM and 2 Way Rows, this tested calculator is perfect for a variety of applications, including business, industrial, and office use. Its brand, Casio, is known for producing high-quality calculators that meet the needs of professionals and students. The model number, FX-115ES PLUS Scientific, is indicative of its advanced capabilities and features. This calculator is categorized as a business and industrial tool, perfect for those in need of accurate and reliable calculations.