Can you bring TENS unit on a plane?
Coop checked the book. Here's the ruling for TENS unit:
What the TSA says
TENS (Transcutaneous electrical nerve stimulation) units are allowed in both carry-on and checked bags. If your doctor has told you that your specific TENS unit shouldn't go through an X-ray, you should notify the TSA officer so they can conduct alternate screening. To help you get through security more efficiently, remove your TENS unit from your carry-on bag and put it in the screening bin so the TSA officer can get a clear view of it. For more information, see TSA special procedures . Devices containing lithium metal or lithium ion batteries should be carried in carry-on baggage. Most other consumer electronic devices containing batteries are allowed in carry-on and checked baggage. For more information to portable electronic devices, see the FAA regulations
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.