How do I test my old filter restriction indicator?

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It is a Gar-Ber vacuum gauge that goes from 0-30 inches of mercury. Would an air conditioning guy, or an engine mechanic have equipment to check before I install or do I look for a scientist with an assistant named Igor?

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How do I test my old filter restriction indicator?
- You could try pulling a vacuum...
  - Thanks Brian
  - But you need to be able to pull the vacuum
    - Here is another way that might be easier.
      - Thanks Steve
- Don't make this complicated

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