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Computers & Gauges

Computers & Gauges

Computers & Gauges

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Buy dive computers and gauges in Canada for scuba diving, freediving, and snorkeling — wrist computers, console computers, air-integrated systems, and analog gauge consoles from Scubapro, Cressi, and Shearwater. A dive computer is one of the most important pieces of safety equipment you will own — it tracks your depth profile in real time and calculates your no-decompression limits far more precisely than dive tables, letting you dive longer and more safely. 

What is a dive computer and why do I need one when scuba diving?
Computers Computer Straps, Chargers, Parts Gauges

Dive computers vs. gauges — what's the difference?

Why a dive computer is worth it
Traditional dive tables calculate your no-decompression limit based on the maximum depth of the dive — which is the most conservative possible calculation. A dive computer tracks your actual depth profile moment by moment and recalculates your limits in real time. If you spend most of a dive shallower than the maximum depth, a computer rewards you with significantly more bottom time than tables would allow. For most recreational divers, the investment in a computer pays off in longer, safer dives from the very first session.

Wrist computer vs. console computer
A wrist computer is worn like a watch and is always in your field of vision without reaching for a console. It is lighter, more compact for travel, and can often double as a freedive or snorkel computer at the surface. A console computer replaces your depth and pressure gauges in a traditional gauge console, providing digital readouts in the same familiar format as an analog console. Console computers suit divers who prefer a single integrated instrument cluster on one hose. Wrist computers suit divers who want a streamlined setup or who dive multiple disciplines.

When a gauge console is still the right choice
Not every diver needs a full dive computer. A traditional analog gauge console — submersible pressure gauge, depth gauge, and compass — provides reliable, battery-independent readings with nothing to configure or update. Some technical divers deliberately use a bottom timer and analog gauges as a backup to their primary computer. For divers on a budget or those who only dive infrequently, a quality analog console is a practical starting point, with the option to upgrade to a computer later.

Air integration — tank pressure on your wrist
Air-integrated dive computers receive tank pressure wirelessly from a transmitter installed on your regulator first stage, displaying remaining air alongside your depth, time, and no-decompression limits on a single screen. The computer can then calculate your surface air consumption (SAC) rate and factor your remaining gas into your NDL calculations — telling you not just how long the algorithm allows you to stay, but whether your air will actually last that long. Air integration does not replace a backup pressure gauge for most recreational divers, but it adds a meaningful layer of information during the dive.

Frequently asked questions

Do I need a dive computer or can I use dive tables?

Dive tables are taught in open water certification as the foundational concept behind decompression theory, and they work — but they are deliberately conservative because they assume you spend your entire dive at maximum depth. A dive computer tracks your actual depth profile and gives you more bottom time by accounting for the shallower portions of the dive. For anyone diving regularly, a computer is safer, more informative, and more practical than tables. Most recreational dive agencies now recommend or require a computer for guided and independent diving.

Is a dive computer the same as a pressure gauge?

No — a pressure gauge shows how much air remains in your tank. A dive computer tracks depth and time to calculate decompression status and no-decompression limits. These are two different pieces of information. An air-integrated dive computer combines both functions — it receives tank pressure wirelessly from a transmitter on your regulator and displays remaining gas alongside depth and decompression data. Without air integration, you need both a dive computer and a separate pressure gauge.

Can I share a dive computer with my dive buddy?

No — a dive computer tracks your individual depth and time profile throughout the dive and uses that history to calculate safe ascent for you specifically. Your buddy's dive profile may be different from yours even on the same dive, and the computer's no-decompression calculations are cumulative across multiple dives. Sharing a computer means one diver has no decompression information at all for part of the dive, which is a safety risk. Every diver should have their own computer.

What should I do with my dive computer between dive seasons?

Store the computer with a fresh or partially charged battery — never store it with a completely dead battery as this can damage rechargeable cells or allow battery compartment corrosion to develop. Rinse and dry thoroughly before storing. Inspect the battery compartment o-ring annually and replace it if it shows any cracking, deformation, or age. Keep the computer in a protective case or pouch away from direct sunlight. Before your first dive of the new season, test all functions in a bucket of water at the surface before entering open water.