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You’ve likely found vials from a vintage or antique spirit level—also known as a “bullseye level” or machinist’s level.
🔍 What It Is:
Those small glass tubes containing three tiny ball bearings are not random curiosities—they’re precision components from an old spherical (bullseye) spirit level, commonly used in:
- Carpentry
- Masonry
- Machinery alignment
- Surveying equipment
