What does the pressure gauge on the SCBA do?

The pressure gauge on the SCBA (Self-Contained Breathing Apparatus) is crucial for monitoring the remaining air pressure within the tank. This information is vital for the user, as it allows them to gauge how much breathable air is still available while operating in hazardous environments, such as during firefighting or rescue operations. Having this awareness ensures that users can manage their air supply effectively, enabling them to exit the situation safely before running out of air.

The other options, while they reference various functions related to personal safety or physiological monitoring, do not accurately describe the role of the pressure gauge on SCBA equipment. The primary function of the SCBA pressure gauge is specifically to track air supply, which is why this answer is the most appropriate and pertinent to the operation of breathing apparatus in emergency scenarios.