HP 42S Scientific Calculator - USED

This unit includes vinyl case and leather brown case (The Calculator Store's)

From Wikipedia, the free enciclopedia: The HP-42S is a programmable RPN Scientific hand held calculator introduced by Hewlett Packard in 1988. It has advanced functions suitable for applications in mathematics, linear algebra, statistical analysis, computer science and others.

This unit includes user's manual (German), and vinyl case.

The HP-42S was released as a replacement for the aging HP-41 series, and is designed to be compatible with all programs written for the HP-41. However, it has received criticism for its lack of expandability, and lack of any real I/O ability, both key features of the HP-41 series. The 42S, however, has a much smaller form factor than the 41, and features many more built-in functions, such as a matrix editor, complex number support, an equation solver, user-defined menus, and basic graphing capabilities. Additionally, it features a two-line dot matrix display, which made stack manipulation easier to understand. Production of the 42S ended in 1995.