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How to determine negative ambient pressure?

  1. Apr 26, 2014 #1
    hello!

    which methods are available to determine (negative) ambient pressure?

    for example, I want to check the pressure inside a plastic see-through box

    can I send a beam of laser, an ultrasound, or something else to determine it?

    thanks!
     
  2. jcsd
  3. Apr 26, 2014 #2

    russ_watters

    User Avatar

    Staff: Mentor

    Use a manometer.
     
  4. Apr 26, 2014 #3
    touchless?
     
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