Know how much air is left in the tank. A SPG can be separate or built into a dive computer and are made in both analog and digital. Description 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. Standard Features 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 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 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). Advertisement More Gear Mask A good snorkel /scuba mask has many options to choose from. Tempered glass, soft silicone rubber and adjustable strap to name a few. Snorkel Dive snorkels come in a large variety of sizes and styles. Used for both snorkeling and scuba diving with options including: comfortable mouthpiece, purge valve and flexible bottom portion. Fins Designed for efficiency and control, the right fin helps both scuba divers and freedivers move through the water efficiently.