Which instrument is used to monitor the tank pressure during a dive?

• A. Depth gauge
• B. Dive computer
• C. Submersible pressure gauge
• D. Compass

Answer: (C)

Monitoring your gas supply during a dive relies on a instrument designed to read the cylinder’s remaining pressure. The submersible pressure gauge attaches to the first stage and displays how much air is left in the tank in psi or bar. This direct readout lets you gauge your air usage, plan a safe ascent, and avoid running low on air.

Depth gauges and compasses serve different purposes: the depth gauge shows how deep you are, and the compass helps with navigation. A dive computer tracks dive parameters like depth and time and may show remaining air if it’s equipped with air integration, but the dedicated means to monitor tank pressure throughout the dive is the submersible pressure gauge.