move when the tube is tilted?
That depends on how the object was designed. Some assemblies contain freely moving spheres, while others hold them in place. Observe the movement gently rather than shaking the tube.
Could it be part of a scientific instrument?
Yes, that is one possibility. Small glass components appear in laboratory equipment and educational demonstrations. Look for measurement markings, fittings, labels, or an associated instrument.
Could the object be valuable?
Possibly, but value depends on its identity, age, condition, rarity, and demand among collectors. It is not possible to estimate its value reliably from the description alone.
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