Aqualung i100 Test: The Essentials for Recreational Diving.

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On a dive boat, excitement mixes with the preparations for gearing up. Simplicity is often key to a successful dive. The Aqualung i100 presents itself as the entry point to the brand, with a strong promise: a single button to control the entire device. However, a dive computer is not just a basic timer. It's the critical tool that manages the diver's decompression safety during each dive. This test aims to determine whether the compromises made to achieve this low price point, particularly its minimalist interface and the deliberate lack of backlighting, still allow for reliable and stress-free recreational diving. We will explore every aspect of this device with the rigor and pedagogy that are our trademarks, to offer you a clear view of its actual capabilities.

Overall score: 3.1/5

Algorithm & Stages (O1)

Behind its very basic appearance, the i100 uses a sophisticated algorithmic engine that will calculate your decompression in a way that is as safe as a more expensive model. The Z+ algorithm, based on the Bühlmann ZHL-16C model, is a recognized standard in the recreational diving world. It incorporates pre-set conservatism factors, adjustable by the user, which offers considerable flexibility to adapt the dive profile to one's own physiological limits. Optional deep stops, with countdown timers, add an extra layer of safety. Audible alerts and the LED alarm indicator are essential elements for managing underwater safety. The mathematical basis is recognized, although it lacks the precision of fully open Gradient Factors. This score of 3.9/5 is quite standard for recreational use, and inspires confidence.

Air & Multi-Gas (O2)

The device performs perfectly well for initial training and diving with standard oxygen-rich mixtures. The management of two gases and an adjustable Nitrox range from 21% to 100% O2 covers the needs of most recreational divers. It is important to note that no air integration is possible with this model. This complete lack of Trimix or CCR capability limits the score in this section to 2.0/5. For a beginner diver or someone who practices simple recreational diving, this limitation is not a drawback. However, for those considering more technical dives, other options should be explored.

Screen & Ergonomics (O3)

This is where the limitations are most noticeable. The "one-button" interface requires patience when configuring a Nitrox setting. The screen is not suitable for very dark environments. The monochrome segmented LCD screen is functional, but its readability is directly affected by ambient light. The complete lack of backlighting is a major constraint for night dives, in quarries, or in deep water. Navigation with a single button, while simple in principle, can become tedious when accessing deeper menus or adjusting settings. This ergonomics, while intuitive for basic functions, can generate some frustration. The lack of backlighting and the depth of the menus with a single button severely penalize the ergonomics, hence a score of 2.2/5.

Battery Life & Power Source (O4)

The Aqualung i100 is a reassuring model for travel. You can change its battery yourself in just a few minutes on the boat deck. The power supply uses a CR2450 lithium battery (3.0V), which is user-replaceable, and this is a major advantage. Tissue saturation data and settings are retained during battery replacement, which is very, very, very convenient. This feature avoids any interruption in decompression calculations, which is essential for safety. The excellent rating of 4.0/5 is due to the typical battery life of button cells and the memory retention, offering a noticeable peace of mind.

Connectivity & App (O5)

Although it is an entry-level model, you can digitally save your dive logs, provided you add a little to your budget. The i100 is compatible with the DiverLog application, available on PC or Mac. The data transfer cable is not included in the basic package and must be purchased separately. This information is crucial for anticipating additional costs. Firmware updates are possible, which ensures a certain longevity for the device. The score of 3.5/5 reflects functional connectivity, but it implies an additional investment for full use.

Compass & Instruments (O6)

The Aqualung i100 does not have an integrated compass, which is a common feature for entry-level dive computers. However, it offers a complete freediving mode, which is an advantage for divers who also practice this discipline. This freediving mode, while not the core function of the device, is a welcome feature. The score of 3.1/5 is fair. It reflects the absence of a compass, but also the presence of a freediving mode that expands the possibilities of use for the dive computer.

Robustness & Depth (O7)

The device is made of sturdy plastic and provides perfectly adequate waterproofing for its recreational capabilities. The maximum certified operating depth of 100 meters is more than sufficient for recreational diving. While the standard plastic design isn't luxurious, it is proven and reliable. It's important to understand that the robustness of a dive computer isn't measured solely by its materials, but also by its ability to withstand the stresses of the underwater environment. The score of 3.0/5 represents a device that fulfills its purpose without unnecessary frills.

Prices & Customer Support (O8)

The Aqualung i100 offers excellent value for money in the entry-level range, costing under €200. Aqualung has a very extensive service network, which is a significant advantage. Aqualung provides very good support. Recent computers are often factory-sealed, which simplifies standard exchanges in case of problems. However, the quality of after-sales service will depend on the local reseller. This point is crucial. A good reseller will be a valuable ally if needed. The score of 4.1/5 is justified by this combination of an attractive price and reliable support, provided that the choice of reseller is made carefully.

The Aqualung i100 is the ideal computer for beginner divers looking for an affordable first piece of equipment. It's a typical first purchase that will safely accompany your initial dives. It's also suitable for experienced divers who want a reliable backup computer, a discreet and effective "backup" to slip into the pocket of their buoyancy compensator (BCD). However, this computer is not ideal for regular divers who perform night or deep dives. The complete lack of screen backlighting would make these experiences potentially frustrating, even dangerous. It will also not be suitable for technical divers who require advanced multi-gas management or air integration.

Aqualung's after-sales service is known for its excellent support. Recent computers, such as the i100, are often sealed at the factory. This means that in case of a failure under warranty, a standard exchange is usually offered, greatly simplifying the process. However, the speed and efficiency of this process will depend on the quality and responsiveness of your local dealer. Therefore, it is very, very, very important to choose a reputable dealer who can effectively assist you if needed. This point, even though not directly related to the computer itself, is an essential component of the long-term user experience.

The Aqualung i100 is powered by a 3.0V CR2450 lithium battery, which can be replaced by the user. This feature is a significant advantage, especially for travel or diving cruises. You are not dependent on an electrical outlet or a specific charger. Changing the battery is a simple operation that can be done in a few minutes, without complex tools. Furthermore, the computer retains all tissue saturation data and settings during replacement, ensuring perfect continuity of your decompression management. This is a practical, reliable solution that offers excellent autonomy for divers.

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 explore other options within the Aqualung range, feel free to consult our reviews of more advanced models. While the i100 is an excellent entry point, the brand offers more sophisticated computers to meet specific needs. For example, check out the Aqualung i200 Review for Bluetooth connectivity, or the Aqualung i300C Review for a richer interface and extended features. Each model is designed with its own philosophy, and it's important to choose the one that best suits your diving practice and underwater ambitions.

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

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