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SESK: Stuff Everyone Should Know · sesk.info/scuba-spg-tank-pressure

Which scuba instrument displays remaining tank pressure?

Submersible pressure gauge, or SPG.

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  1. Depth gauge
  2. Submersible pressure gauge ✔
  3. Compass

Why: The SPG connects to the high-pressure port and reads cylinder pressure in psi or bar, so you know your air supply.

Huh, didn't know that: An SPG can be a separate gauge or built into an air-integrated dive computer.

The dad joke
Why does the SPG get invited everywhere? It always knows how much air is left in the room.
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References

Answer: Submersible pressure gauge. The SPG connects to the high-pressure port and reads cylinder pressure in psi or bar, so you know your air supply.

  1. PADI Gear: SPGs www.padi.com/gear/spgs
    Your SPG displays how much air remains in your tank so that you can end your dive well before you get too low.
    Checked 2026-10-12.
  2. PADI Gear: Regulators www.padi.com/gear/regulators
    Connected to a high pressure port on your first stage
    Checked 2026-10-12.

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