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. Visit your PADI Dive Center or Resort to get advice about the right SPG for you.
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).