Engineering and Magnetics keypads let you select the units used in many of the functions.Briefly, unique to the 6 keypads are: Standard; contains several of the functions found on a normal scientific calculator (log, ln, N!, etc.), and some unique to itself: a simple math teaching aid for kids, Wind Chill calculator, and more. Engineering; handles problems like Resonant Frequency, Ohms Law, Parallel Complex Impedances, Polynomial Equations, Impedance of a Ladder Network, and lots more. Binary; is used to manipulate unsigned Binary integers of various lengths (word size) from 4 to 64 bits, about 28 functions are available. Magnetics; eases the design of transformers and inductors with many built in functions unique to magnetic component design.Trig; solves Arc Length, Right Triangle, and any Defined Plane Triangle problems, also computes the trig functions, as well as some hyperbolic functions. Converts Radians to Degrees, and Hours, Minutes, Seconds to Decimal Hours and vice versa. Convert; thousands of conversion plus more than 40 physical constants and many specific gravities.