Which key air management principle can be based on the lowest cylinder gauge reading of a team member?

Name: Which key air management principle can be based on the lowest cylinder gauge reading of a team member?
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Question

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The "point of no return" is a key air management principle based on the lowest cylinder gauge reading of a team member. It determines the furthest point a team can safely travel into a structure or hazardous environment before needing to turn back to ensure enough air supply to return safely.

Which Key Air Management Principle Can Be Based on the Lowest