RPN-45 SD is a comprehensive simulation of the renowned scientific hand-held calculator HP-45 fromThis app offers a photo-realistic interface based on the original device, with the choice of LED or high-contrast LCD display. Users can enjoy features like a built-in printer for calculation records, animated keys with adjustable feedback, and a "secret" stopwatch with extended capacity.

The application fully implements all functions and operations of the HP-45, allowing for complex number calculations, non-volatile stack and registers, and various mathematical operations. Additional features include solving equations, statistical calculations, date calculations, and more, making it a versatile tool for professionals and enthusiasts alike.