This RPN calculator offers 250 solutions with six unique keypads. It has a complete help system with individual tips for all but the most ordinary functions and a Tip of the Day feature for new users. You can select fixed, scientific or engineering notation and degrees, radians, or grads as required. You can save and print the contents of the running tape display. The functions available using any keypad are: STO, save up to 4 numbers into memory, 2 of these storage registers can be used for register arithmetic; Lastx, retrieves the last number that was used; Drop, deletes the number in x-reg and Drops the number in y-reg into x-reg; x<>y, exchanges the values in the x-reg and y-reg; x²; square root of x; 1/x; and 8 constants involving pi are on all but the Binary keypad. Standard, Engineering and Trig keypads also have a function to convert between polar and rectangular coordinates. 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.