Casio 991 ES plus || الة حاسبة كاسيو 991 العلمية

The Casio 991 ES plus calculator is an advanced scientific calculator. It features a two-line, 12-digit, natural textbook display and a 10-digit, four-line display for equation entry. It also offers over 280 built-in functions including symbolic, graphic, financial, and statistic functions. This makes it an invaluable tool in mathematics, science and engineering applications.