Will it fly?
Can you bring Medical-Clinical Thermometer (Mercury) on a plane?
Coop checked the book. Here's the ruling for Medical-Clinical Thermometer (Mercury):
CARRY-ON
No
CHECKED BAG
Yes (Special Instructions)
What the TSA says
The FAA allows one small Medical-Clinical Thermometer (Mercury) per passenger for personal use in checked bag only. The thermometer must be in a protective case. Tip: Thermometers with a red line instead of silver are not mercury and not restricted. Digital thermometers are also not restricted, unless powered by lithium batteries. See FAA regulations for more information on quantity limits.
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.