SPG (Submersible Pressure Gauge)
Definition
An SPG is a gauge used by divers to monitor the remaining air pressure in their scuba cylinder.
More on SPG (Submersible Pressure Gauge)
An SPG connects to the first stage of a regulator via a high-pressure hose and displays cylinder pressure in PSI or bar. It's critical for dive safety, enabling divers to track their air supply throughout the dive. SPGs may be analog or digital, and often integrated into a console with depth and compass gauges. Even with air-integrated dive computers, many divers carry a backup analog SPG for redundancy and reliability.
Frequently Asked Questions
It allows divers to track air consumption and avoid running out of air underwater, which is a serious hazard.
It attaches to a high-pressure port on the first stage of your regulator via a hose.
Most use PSI (US) or bar (metric), depending on the region and tank specifications.
Check it frequently during the dive—at least every few minutes or after significant exertion.
Yes, though rare. Carrying a backup method (e.g., air-integrated computer) adds redundancy.