This HP-42S RPN scientific calculator with manual is a vintage gem that is perfect for collectors and enthusiasts alike. Made by Hewlett Packard, this calculator was manufactured in Singapore and still works perfectly. It features Reverse Polish Notation (RPN) and includes a user manual for easy reference.

The calculator is a great addition to any collection of vintage electronics or calculators. It has been tested and is in good working condition. Its sleek design and high-quality construction make it a must-have for any serious collector.