Detailed review and test of the Shearwater Tern TX Limited Edition. A watch-format computer with AMOLED display, 3D compass, air integration, and Bühlmann ZHL-16C.
To learn how to get the most out of your gear underwater, discover the AquaExposure training.
When maneuvering a heavy video tray equipped with a Sony RX10V or handling an Insta360 X5 pole in the cold and often murky waters of Belgian quarries, the bulk of instruments becomes a decisive logistical criterion. Large consoles can quickly hinder movement or strike the underwater housing. This is where the Shearwater Tern TX (and particularly its superb Limited Edition variations) makes perfect sense. Spiritual replacement for the Teric, this model adopts an ultra-compact watch format without sacrificing readability, thanks to its 1.3-inch AMOLED screen. Hosting air integration, a 3D compass, and the highly rigorous Bühlmann ZHL-16C algorithm, the Tern TX promises to be the ultimate tool to free the forearms of demanding recreational divers and photographers. Let's see if this miniaturization lives up to the Canadian brand's reputation.
Global Score: 4.4/5
| Criterion | Score | What this means |
|---|---|---|
| Algorithm & stops | 5.0/5 | Pure Bühlmann ZHL-16C model with freely adjustable Gradient Factors. |
| Air & multi-gas | 3.5/5 | Excellent for recreation/deco (3 Nitrox gases), but penalized by the absence of Trimix/CCR compared to pure tech models. |
| Screen & ergonomics | 4.8/5 | Gorgeous 1.3\" AMOLED display. Navigation via 4 physical buttons ideal for dry gloves. |
| Battery & power | 4.0/5 | Wirelessly rechargeable battery, about 20 hours of battery life in dive mode. |
| Connectivity & app | 5.0/5 | Native Bluetooth to Shearwater Cloud, an absolute industry reference. |
| Compass & instruments | 5.0/5 | Compensated 3D compass and highly complete freediving mode (haptic). |
| Robustness & depth | 4.5/5 | Titanium bezel, sapphire crystal, waterproof to 120 meters. Premium finishes on the Limited Edition. |
| Price & service | 4.0/5 | A significant budget for a recreational watch, but backed by a legendary global support network. |
This computer is suitable for: Advanced divers, underwater photographers looking to free up their wrists, or instructors wanting an elegant everyday watch that is ultra-powerful underwater.
This computer is not ideal for: Deep Trimix or closed-circuit rebreather (CCR) divers, who must orient themselves toward a Perdix 2 or Teric.
True to its DNA, Shearwater makes no compromises on the transparency of its decompression calculations.
Algorithm: Bühlmann ZHL-16C. The assurance of clear and reliable decompression calculations. (Score: 5/5)
Gradient Factors: Fully configurable (e.g., 30/70 or 85/85) to adapt the level of conservatism to the reality of your immersion. (Score: 5/5)
Deco display: NDL, TTS, and stop ceilings are clear. The AMOLED color-coding allows you to immediately isolate critical data. (Score: 5/5)
Alert: The Tern TX benefits from a highly powerful haptic vibration motor to signal ascent or tissue loading alerts. (Score: 5/5)
Oriented toward recreation and light decompression, it is perfect for planning a dive with bottom gas and a deco cylinder.
Number of gases managed: Up to 3 gases (Air and Nitrox up to 100% O2). (Score: 3/5)
Trimix & CCR: Absent. (Score: 1/5)
Air integration: Compatible with up to 4 wireless transmitters. This is absolute comfort for monitoring cylinder pressure at a glance, or even displaying buddy cylinder pressure during instructional dives.
[!CAUTION] Ultrasonic transmitter caution (AquaExposure doctrine): A portion of wireless air pressure transmitters (including compatible models) use ultrasonic waves technology (around 38 kHz). Some marine species perceive ultrasound. Although scientific literature does not demonstrate established nuisance to wildlife today, uncertainty warrants caution. In the field, we observe a perceptible and potentially disturbing signal. On this basis, AquaExposure strongly advises against purchasing a computer with an ultrasonic transmitter.
The great strength of this model is to offer a readable screen in a casing of contained dimensions.
Screen type: 1.3-inch AMOLED panel. Colors are vivid and blacks deep, eliminating the typical light halo of old backlit LCD displays. (Score: 5/5)
Navigation: The interface relies on 4 physical steel buttons. Unlike a capricious touchscreen underwater, this design is ideal and infallible when wearing thick dry gloves. (Score: 4.5/5)
Limited Edition: These series generally offer exclusive aesthetic finishes (treated titanium bezel, specific straps) that enhance the object on the wrist out of the water.
The watch format imposes a rechargeable internal battery, managed here with great modernity.
Battery type: Internal Li-ion battery, with wireless induction charging via a magnetic dock (included). (Score: 3.5/5)
Autonomy: Around 20 hours of diving (depending on brightness), and several months in classic watch mode. (Score: 4.5/5)
Shearwater's software workflow remains untouched.
Synchronization: Very fast automatic Bluetooth. (Score: 5/5)
Application: Shearwater Cloud on smartphone and desktop allows you to analyze decompression profiles with millimeter precision. (Score: 5/5)
The integration of sensors transforms this watch into a complete flight deck.
Compass: 3D digital, tilt-compensated. Very fluid for navigation. (Score: 5/5)
Freediving Mode: Dedicated Freedive mode, with fast sampling and discrete vibrating alerts. (Score: 5/5)
Under its refined city watch looks, the Tern TX is armored equipment.
Materials: Reinforced polymer casing, massive titanium bezel, and scratch-resistant sapphire crystal. (Score: 5/5)
Certified depth: 120 meters. (Score: 4/5)
Canadian engineering and quality have a price, but long-term support is guaranteed.
Value for money: Around €750-800, it is a premium investment for a recreational computer, justified by the AMOLED display and titanium finish. (Score: 3.5/5)
Service: The Shearwater network is exceptionally responsive and well-established in Europe. (Score: 5/5)
Screen size: Although the AMOLED is sublime, the screen size remains that of a watch (1.3\"). If your near vision is weakening, a large rectangular screen model (like the Peregrine TX) will probably be more comfortable to read at a glance.
Proprietary charger: Since it recharges via induction on a specific small dock, it is imperative not to forget it when packing bags for a dive trip.
Using a parameterizable algorithm, even the excellent Bühlmann ZHL-16C, has the sole purpose of mathematically framing your desaturation based on a risk profile. There is no method or technology to \"artificially maximize bottom time\" or \"cancel\" micro-bubbles. Such notions are erroneous, dangerous, and must be absolutely avoided. You must conform to the physiological constraints dictated by the computer.
Moreover, wireless air integration does not dispense you from carrying a backup control method (classic mechanical pressure gauge or backup regulator). Finally, regardless of the beauty of the AMOLED screen or the need to adjust camera settings in immersion, instrument manipulation must never alter your breathing safety: always keep the regulator firmly in your mouth, from descent to surface return, without exception.
The Shearwater Tern TX Limited Edition is a small jewel of underwater technology. By integrating the 3D compass, air integration, and Bühlmann algorithm into a watch casing that is both robust and elegant with a titanium bezel, it speaks directly to expert recreational divers. It is the dream tool for videographers or photographers who wish to maintain instant visual access to decompression and tank pressures without overloading their forearms. While it is not intended to accompany deep tech divers using Trimix, it stands out as one of the most readable, intuitive, and safe dive watches of its generation.
The watch runs on an internal rechargeable lithium-ion battery. Thanks to its wireless magnetic induction charging via the included dock, the Tern TX presents zero casing leakage risks. Battery life in active dive mode is approximately 20 hours, while it can run for several months in simple watch mode.
To learn more about choosing batteries and extending the life of your computer, read our complete guide to dive computer batteries.
If you prefer a watch format with integrated land multisport features in addition to diving, you can consult our Garmin Descent Mk3i review. For an even more technical watch model capable of managing Trimix and CCR, read our Shearwater Teric review. Finally, for a large screen format without air integration, refer to the Shearwater Peregrine Adventures Edition review.
To compare this computer with other models, check our dive computer comparator.
The Tern TX integrates a 3D digital compass and supports wireless air integration (up to 4 transmitters), features that are missing from the basic Tern model.
No, it is a computer geared toward advanced recreational and light technical diving. It manages up to 3 Nitrox gases (up to 100% O2), but does not support Trimix or CCR systems.
Yes, the 1.3-inch AMOLED display offers outstanding contrast and deep blacks, making it perfectly readable even in complete darkness or loaded waters.
The Tern TX uses an internal lithium-ion battery rechargeable wirelessly via induction. There is no battery to be changed by the user.
