This is a Hewlett-Packard financial calculator, likely from the 1990s. It features a heavy-duty design and operates using Reverse Polish Notation. It runs on three button cell batteries (LR44). The unit has been cleaned, both the case and the interior. I have performed basic calculations and confirmed that it operates without issues. I have also run the self-test and confirmed that the display functions correctly. However, I have not verified that all functions are working perfectly. A dedicated pouch and instruction manual are included. The condition of the instruction manual's interior is unknown, but it is wrapped in film, suggesting it is new. The exterior of the main unit is relatively clean, but there are some minor scratches and blemishes. Please examine the photos carefully to assess the condition. The cover shows signs of use and has writing on it. It is currently working, but due to its age, I cannot guarantee its functionality after shipping. Please feel free to ask any questions before purchasing.