Ratio iX3M

At a glance

Ratio iX3M is a dive computer from Ratio, rated 4.5 out of 5 and placed 8 of 33 in our dive computers shortlist. Its defining number is depth rating: 200 m. It scores hardest on bench performance (90/100) and softest on value for money (60/100). The clearest advantage divers report: extremely versatile for recreational and technical diving.

What the dive computer actually gives you

Where it wins and where it costs you

Full review: Ratio iX3M

The Ratio iX3M is a technical dive computer built by Ratio Computers, an Italian manufacturer known for producing rugged, feature-dense instruments aimed at serious recreational, technical, and rebreather divers. The iX3M line is recognized for its color TFT display, which offers clear visibility of critical dive data even in low-light or turbid conditions common in deep or wreck diving. It supports multiple gas mixes, including air, nitrox, and trimix, making it versatile across a wide range of diving disciplines from single-tank recreational dives to complex multi-stage technical descents. The computer also offers CCR (closed-circuit rebreather) compatibility in certain configurations, positioning it as a serious tool for divers who require precision gas management alongside decompression tracking.

Built with durability in mind, the Ratio iX3M features a robust housing designed to withstand the pressures and physical demands of deep and cold-water diving environments. Its user interface allows divers to toggle between multiple display modes, giving quick access to depth, time, decompression stops, ascent rate, and gas mix data without needing to navigate cumbersome menus mid-dive. The device typically includes a built-in compass and can integrate with optional air integration transmitters, allowing divers to monitor tank pressure wirelessly alongside their dive profile. Battery options vary by model version, with some iterations offering rechargeable batteries and others using user-replaceable cells, giving divers flexibility depending on their diving frequency and travel needs.

Beyond its technical capabilities, the Ratio iX3M is valued for its customizable algorithms, allowing experienced divers to fine-tune conservatism settings, deep stops, and gradient factors according to their personal risk tolerance and dive planning philosophy. Many versions of the device support PC connectivity for logging dives, downloading software updates, and analyzing dive profiles in greater detail after surfacing. This makes the iX3M particularly appealing to divers who take a methodical, data-driven approach to their diving practice, whether for technical certification progression, scientific diving, or extended expedition-style dive trips. Overall, the Ratio iX3M stands out in the dive computer market as a feature-rich, adaptable instrument tailored to divers who demand precision, configurability, and reliability from their gear.