This Hewlett Packard HP 42S RPN scientific calculator is a vintage piece that has been tested and confirmed to be working. It comes with a case and is perfect for collectors or anyone who wants to use it for calculating purposes. The calculator is made by HP, a well-known brand in the electronics industry, and is a great addition to any vintage electronics collection.

The model is HP42S, which is a great choice for anyone who wants a reliable and accurate calculator. This calculator is perfect for people who enjoy vintage electronics or who simply want a calculator that can handle complex calculations. It falls under the categories of consumer electronics, vintage electronics, and vintage calculators, making it a great choice for collectors and enthusiasts alike.