I’m into other forms of retro electronics and I must warn you. It sounds like you’re veering into hobby territory.

You found this thing. It might be neat. But let’s say you pick it up and find that the batter doesn’t hold a charge very long. Do you buy another one, or do you invest in new tools for tiny electronics, maybe some jewelers style magnification and lighting, and invest time into learning how to service this device, building skills and knowledge from the experience.

To me this sounds great, assuming you can afford a hobby, or find ways to make the hobby affordable. What other interesting directions could the new skills and tools take you in?