Can you bring Weather Barometer or Thermometer (Mercury) on a plane?
Coop checked the book. Here's the ruling for Weather Barometer or Thermometer (Mercury):
What the TSA says
Weather Barometer or Thermometer (Mercury) These devices contain more mercury than consumer devices and may only be carried by a representative of a government weather bureau or similar agency in carry-on baggage. The individual must advise the airline of the presence of the mercury barometer or thermometer in the carry-on baggage. The thermometer must be transported in strong outer packaging having a sealed inner liner or bag constructed of strong, leak-proof and puncture-resistant material that is impervious to mercury and will prevent the escape of mercury from the package in any position. See FAA regulations
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.