Shearwater Perdix 2 Review for Serious Divers
A dive computer becomes part of your decision-making long before the alarm sounds. It needs to be readable when visibility drops, predictable when your plan changes, and easy to configure without turning pre-dive preparation into a software project. This Shearwater Perdix 2 review looks at whether one of the most capable wrist computers available is the right fit for recreational, technical and sidemount divers.
What the Perdix 2 is built to do
The Perdix 2 is a full-size, wrist-mounted computer designed around clear information, extensive configuration and long-term use across changing dive styles. It is not positioned as a simple holiday computer. Its value is in giving a diver room to progress from recreational nitrox diving into staged decompression, multiple gases, closed-circuit rebreather diving or air-integrated configurations without needing to replace the computer.
Its 2.2-inch colour LCD display is the first thing most divers notice. Figures are large, layouts are purposeful and the display remains easy to read at a glance. For divers who wear prescription masks, use a hood, or simply prefer not to squint at a small watch-style screen, this is a meaningful advantage rather than a luxury.
The computer uses Shearwater's familiar two-button control system. Each button has a clear role, and the menus are logically arranged. There is still plenty to learn if you intend to adjust gradient factors, gas settings and display layouts, but routine tasks are far less frustrating than on computers that rely on complicated button combinations.
Shearwater Perdix 2 review: display and build quality
The screen is housed in a hard-wearing ballistic nylon polymer case, with a titanium bezel and buttons. The Perdix 2 is available in titanium and titanium black finishes, and both feel designed for regular boat diving, travel and technical diving rather than occasional use. It is substantial on the wrist, but not uncomfortably heavy.
A sapphire crystal protects the display. That matters on a computer likely to spend time against ladder rungs, cylinders, cave line hardware and camera equipment. Sapphire is highly scratch resistant, though it is not invincible. A protective case is still sensible for divers who carry their computer loose in a crowded gear box.
Underwater, the screen performs very well in low light. The high-contrast display and adjustable backlight make it easy to separate depth, no-decompression information, ascent data and gas details. During night dives or inside wrecks, the difference between a legible screen and a merely bright screen is significant. Shearwater has got that balance right.
The Perdix 2 also includes vibration alerts. These complement the visual and audible alarms, which can be useful when you are managing a camera, scooter or task load. Haptic alerts are not a substitute for checking your computer regularly, but they add another useful layer of awareness when conditions are busy.
Diving modes that grow with your plans
A major reason to choose the Perdix 2 is its flexibility. It supports recreational open-circuit diving, technical open-circuit diving, closed-circuit and bailout modes, and gauge mode. The technical configuration supports multiple gases, making it a credible primary computer for divers using travel gas and decompression cylinders.
The underlying decompression model is Bühlmann ZHL-16C with adjustable gradient factors. This gives trained divers the ability to set conservatism in a way that suits their experience, training agency procedures and exposure profile. It also means the computer should be configured deliberately, not simply taken out of the box and trusted blindly.
For a diver progressing from single-cylinder nitrox to twinset or sidemount decompression diving, this continuity is valuable. The operating logic remains familiar while the available features expand. A recreational diver who expects to stay within no-decompression limits, however, may not need this degree of capability. A smaller, less expensive Shearwater model may be the more proportionate choice.
Air integration for streamlined gas monitoring
The Perdix 2 can pair with up to two compatible Shearwater Swift transmitters. This is especially useful for sidemount divers monitoring independent cylinders, or for technical divers who want a clean view of back-gas and stage pressure. Tank pressure, remaining gas time and selected-cylinder information can be displayed in layouts that suit the diver's priorities.
Air integration is useful, but it should not replace disciplined pressure checks or an analogue SPG where your training and setup require one. Transmitters add cost, need battery management and can introduce another point to check before a dive. For many divers, the benefit is a cleaner, more immediate gas picture. For others, particularly those who favour simple travel equipment, a non-air-integrated setup may be preferable.
The Swift transmitter's collision-avoidance design is a practical benefit on boats where several air-integrated computers are in use. Pairing is generally straightforward, but the best setup is still the one tested fully before departure, not at the stern with the boat preparing to leave.
Battery choice matters more than it sounds
The Perdix 2 runs on a user-replaceable AA battery. This is one of its strongest practical features. Instead of relying on a proprietary charging cable or waiting for a sealed battery to be serviced, you can carry a suitable spare battery and make a replacement yourself.
Battery life depends on the battery type, backlight use and dive habits, but the AA format makes planning simple. Lithium AA batteries are popular for longer endurance and travelling, while alkaline batteries are readily available in many places. Check Shearwater's approved battery guidance and replace the battery with clean, dry hands in an appropriate environment. A battery change is easy, but a flooded battery compartment is not.
For divers travelling from Singapore to remote regional destinations, this practical independence can be more valuable than a rechargeable system. A USB cable is convenient until it is left at home or a charging point is unavailable.
Compass, logging and everyday use
The integrated digital compass is clear and easy to use once calibrated. It is not a reason to abandon basic navigation skills, but it is a capable tool for running reciprocal headings, returning to a shot line or holding position on a planned course. As with every electronic compass, keep it away from magnetic interference when calibrating and verify it before an important dive.
Bluetooth connectivity allows dives to be transferred to Shearwater Cloud for logging and firmware updates. Logging is useful for reviewing gas consumption, depth profiles and exposure over time. Firmware updates can also add refinements and features, which helps the computer remain relevant rather than becoming fixed at the specification it launched with.
Daily use is helped by customisable display layouts. A photographer may prioritise time, depth and no-decompression limit. A technical diver may place stop information, time to surface, gas pressure and current gas front and centre. This level of adjustment is one of the Perdix 2's real strengths, provided you resist the temptation to fill every area of the screen. A good layout highlights the information you genuinely act on.
Who should buy the Perdix 2?
The Perdix 2 makes most sense for divers who want a large, highly readable primary computer and expect their diving to develop. It is particularly well suited to technical divers, sidemount divers, divers wearing thick exposure protection, and anyone who values replaceable batteries and a configurable display.
It also works well for an experienced recreational diver who wants one computer to keep for many years. The price is higher than entry-level and compact watch-style models, but that premium buys screen size, durability, air integration options and a feature set that will not quickly feel restrictive.
The trade-off is size and capability. It is larger than a minimalist travel watch, and some users will never touch its advanced modes. If your diving is limited to warm-water recreational profiles and you want something discreet for everyday wear, the Perdix 2 may be more computer than you need. Buying for future plans is sensible, but buying complexity you do not want to learn is not.
Setting it up for your diving
Before its first proper dive, set units, gases, conservatism, alarms, display layout and time format on land. If you are adding transmitters, pair them at home or in the dive centre rather than during a rushed kit-up. Technical divers should ensure their gas labels, computer settings and written dive plan all agree.
At Deep Dive Supplies, we see the best equipment choices come from matching a computer to the whole system: cylinders, regulator configuration, exposure protection, mounting position and the kind of diving you actually intend to do. The Perdix 2 is at its best when its advanced options support a considered setup rather than complicate it.
The Shearwater Perdix 2 is not the cheapest route to a capable computer, but it is a dependable choice for divers who want clear information and room to progress. Set it up carefully, practise using its functions in straightforward conditions, and it can remain a trusted part of your kit as your dives become more demanding.