Identifying Small Glass Tubes Containing Three Tiny Ball Bearings: What Could They Be?

glass?

Are the balls approximately identical in size?

Does the tube have a stopper or sealed ends?

Is there a label, measurement scale, or printed marking?

An educational object may have been designed to make a simple physical process visible.
3. A Vintage Toy or Novelty Item

Small glass components sometimes appear in older toys, games, and novelty objects. Metal balls may be used as moving pieces, weights, or parts of a balancing mechanism.

If the tube was found with other old toys or collectibles, this possibility may be worth investigating.

Clues to look for:

Brightly colored ends or decorative