What does a submersible pressure gauge indicate?

A submersible pressure gauge indicates the pressure of the surrounding water at your current depth, which in turn can be used to determine depth. The gauge measures the water pressure exerted on it, and this pressure increases with depth due to the weight of the water above.

While options related to tank air and remaining air levels might seem relevant, they pertain to different types of gauges. A submersible pressure gauge does not measure air volume or remaining air; it specifically responds to water pressure changes as you descend or ascend in the water column. This function is crucial for divers, as understanding depth is essential for safety and planning dives. Thus, the correct understanding of what a submersible pressure gauge indicates is fundamental for safe underwater activities.