Identification of pressure component

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MMCS
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Attached is a picture of a component i am trying to identify. I assume it is either a piezoelectric sensor or a wheatstone bridge, But i don't know which one?
 
Attachments
  • Close-up photo of a small green circuit board with a round clear-capped component on one end, a red-brown disc inside, four solder pads at the other end and a handwritten label reading R2.
    press.jpg
    36.1 KB · Views: 437
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Discussion

Might help to know more about the context? What's it out of?
 
My vote is the piezoelectric thingamabob.
 
Its from an air pressure gauge, probably should have included that initially.
 

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