Final answer:
The pressure gauge on a fire extinguisher indicates if it is still operational.
Explanation:
The purpose of the pressure gauge on a fire extinguisher is to indicate whether it is still operational. This is crucial because it allows users to know if the extinguisher is properly pressurized and ready to be used in case of a fire emergency. By checking the pressure gauge, users can ensure they have a functional fire extinguisher when needed.
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