❌ What It’s Not:
Not a chemical vial or medical device
Not a toy or modern sensor
Not hazardous waste (if sealed)
💡 Final Thought:
These little tubes are miniature marvels of pre-digital engineering—a quiet testament to craftsmanship when precision came from glass, steel, and gravity alone.
So if you’ve found one, you haven’t just uncovered a curiosity—you’ve held a piece of industrial history in your palm. 🛠️✨
