An award-winning calculator with almost every feature imaginable, including an editable tape that automatically recalculates when you make changes. Judy's TenKey is completely configurable, so you can choose what to show on the screen, and can have it act like an adding machine, a standard calculator, or an RPN scientific calculator. It includes statistical and financial functions, as well as other standard functions. Options include number of decimals to show, automatic decimal insertion, red negatives, always on top, scientific notation, and much more. Comes with an interactive tutorial.