Your SPG displays how much air remains in your tank so that you can end
your dive well before you get too low. An SPG can either be a mechanical
gauge connected by a hose that reads the pressure in bar (metric) or
psi (imperial, pounds per square inch) in your tank, or it may be built
into your dive computer.
Easy to read and understand, because you use your SPG constantly during a dive to monitor your air supply.
Securely attached so you can quickly and easily find it. Plus, you don’t want your SPG dangling, causing drag, hitting sensitive aquatic life or becoming damaged.
Optional and Desirable Mask Features
Some air-integrated dive computers evaluate your breathing rate and estimate how long your air will last.
Some air-integrated dive computers use hoseless SPG technology that sends pressure readings from a transmitter on your regulator first stage to the dive computer on your wrist.
Gauge consoles group your SPG, dive computer or depth gauge, and your compass in one handy component.
How to Choose YourGauge
With the wide variety of masks available today, it will be more difficult to decide which one you like best, rather than finding one that fits and is comfortable. Here are some tips from the Diving Locker Pro's
It’s logical to select your SPG when investing in your regulator, or complete scuba package, and have it attached by the dive professional at your PADI dive shop. If looking at mechanical gauges, be sure to purchase the measuring system you’re used to – bar (metric) or psi (imperial).
You might want to consider investing in a modular gauge such as the Suunto CB-One, which allows you add on a depth gauge and/or compass either right away or later on down the road