🧪 Are They Mercury?
Older tilt switches sometimes contained mercury, but:
Modern versions usually use metal balls instead
Three tiny ball bearings strongly suggest a mercury-free design
That’s safer and more environmentally friendly.
⚠️ Important Safety Note
Because the tube is glass:
Don’t crush or break it
Keep away from small children or pets
If broken, dispose of it carefully.
🛠️ Other Possibilities
Less commonly, similar-looking tubes may be:
Reed switches (magnetic switches)
Tiny fuses
Vibration sensors
But the moving ball bearings are a strong clue that it’s a tilt or motion switch.
💡 Bottom Line
A small glass tube with three tiny ball bearings is usually a harmless electronic motion or tilt sensor designed to detect movement or orientation.
Tiny parts like these quietly power many everyday devices. ⚙️✨
