The EL-531XBWH is a fully-functional, high quality scientific calculator that performs over 272 advanced scientific and mathematical functions. Direct Algebraic Logic function that allows students to enter the elements of an expression in the exact order they appear in the textbook. Advanced technology and engineering gives you the pin-point accuracy. It is ideal for students studying general math, algebra, geometry, and trigonometry. In addition, it can be used for statistics, biology, chemistry, and general science.