Suunto DX Review: The titanium watch for the eco-conscious user.

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Arriving on the deck of a technical diving boat with just a simple watch on your wrist often elicits curious glances. Historically, deep dives using Trimix or closed-circuit rebreathers (CCR) required massive computers, strapped to the forearm by thick elastic bands. The Suunto DX was designed to break this rule. Machined from a block of titanium, it conceals a powerful decompression engine beneath its city watch appearance, intended for extreme divers.

But a dive computer is more than just a luxury timepiece, it's the critical tool that manages the diver's decompression safety during each dive. Faced with technically advanced competitors that focus on massive color OLED screens, does the Suunto DX and its LCD screen still offer operational advantages in the 100-meter range? This test aims to determine whether this exceptional "tek" watch still justifies its price point.

Overall score: 4.0/5

**This computer is designed for:** Rebreather divers (CCR) or Trimix divers who want to provide redundancy for their primary technical equipment with a complete and indestructible computer in a watch format. This computer is not ideal for: Recreational divers (too complex) or technicians who require a customizable color display.

Algorithm & tiers (3.5/5)

The DX relies on the Suunto Fused RGBM, a proprietary algorithm designed specifically to merge decompression for recreational dives with that of deep technical dive profiles. While extremely reliable, it does not offer free adjustment of the Gradient Factors (Bühlmann), which has become the standard in modern technical diving. However, the display of the ceiling and TTS remains clear.

Air & mixed gases (5.0/5)

This is the heart of the machine. The DX manages up to 8 gases in open-circuit mode (Oxygen and Helium for full Trimix). Even more importantly, it has a native CCR (Closed Circuit Rebreather) mode of a very high level. You can configure up to 3 different diluents, set high and low setpoints, and instantly switch to open-circuit (Bailout) in case of rebreather failure. It's an undeniable 5/5 on capabilities.

Screen & Ergonomics (2.5/5)

The display uses a mineral matrix LCD (49 x 22 pixels) with backlighting. The contrast is good, but managing 8 gases and recycler setpoints with only 4 buttons and outdated menus requires significant learning effort. In this regard, modern color computers with explicit menus have made great strides.

Battery Life & Power (3.5/5)

The device is powered by a CR2450 button battery, offering approximately one to one and a half years of use. While it is technically possible to replace the battery yourself, this is strongly discouraged: opening a titanium casing certified for 200 meters requires a rigorous pressure test in a chamber, which can only be performed by an authorized Suunto service center.

Connectivity & App (3.0/5)

Like the D6i series models, the lack of Bluetooth is a drawback. Transferring your decompression profiles (up to 140 hours of internal logging) is done via a proprietary USB cable to the Suunto DM5 desktop software (PC/Mac).

Compass & Instruments (5.0/5)

The integrated 3D digital compass offers exceptional tilt compensation. In enclosed environments (wrecks or caves) often frequented by technical divers, the ability to accurately orient oneself while reading one's decompression time is a major safety advantage.

Robustness & Depth (5.0/5)

The shielding is complete. Machined from titanium (Grade 5), the case is resistant to corrosion and extremely lightweight on the wrist compared to steel. The protective glass is made of pure sapphire crystal, which is highly resistant to scratches. The depth rating certification is set at 200 meters, covering all needs for underwater exploration.

Price & Customer Service (3.5/5)

Positioned in the very high-end segment, the price of the titanium and the CCR software is noticeable. The catalog price is high, but it's the cost associated with the excellence of the materials and the impressive network of Suunto customer support.

The Suunto DX is designed for experienced rebreather or trimix divers who are looking for a reliable and discreet redundant dive computer that can accompany them in the most demanding environments. Its robustness and versatility make it a relevant choice for those who prioritize durability and technical performance in a watch format. However, it will not be suitable for recreational divers who may find its features too complex and its interface less intuitive than models designed specifically for recreational diving. Similarly, technicians who require a customizable color display and more flexible gradient factor management may consider other options.

The Suunto customer service is decent, but it is crucial to note that the device's firmware is critical. It is imperative to consistently update the firmware before every dive to ensure optimal performance and diver safety. Suunto's global network ensures good availability for maintenance and repairs, although battery replacement requires a visit to an authorized workshop for a rigorous water tightness test.

The Suunto DX is powered by a CR2450 button battery. This provides an impressive battery life of approximately one to one and a half years. However, while technically possible for the user to replace, it is strongly discouraged. Opening the titanium casing, which is certified for 200 meters, requires a pressure test in a sealed chamber, a procedure that can only be performed by an authorized Suunto service center. This means planning for maintenance, especially if you are on a cruise or far from a service center.

To find out which battery to buy for this computer, check out our complete guide on batteries for dive computers. To learn how to replace the battery yourself step by step without risking damage, read our complete tutorial on how to change your own battery.

To discover other innovations from the Suunto brand, you can check out our reviews of the Suunto D5 or the Suunto EON Steel, which offer different approaches to diving, from recreational to technical exploration.

To compare this computer with other models, see our diving computer comparison tool.

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