Identifying Small Glass Tubes Containing Three Tiny Ball Bearings

❌ What It Isn’t

  • Not a laboratory vial or medical item
  • Not a toy or modern electronic sensor
  • Not hazardous waste as long as it remains sealed

These small glass tubes represent clever engineering from the pre-digital era—a time when accuracy depended on glass, metal, and gravity. Holding one isn’t just examining an object; it’s connecting with a piece of craftsmanship history.

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