The Shearwater Tern TX is the air-integrated version of Shearwater's compact watch-style dive computer, built for sport and recreational divers who want wireless gas monitoring in a small form factor. It connects to up to four Swift transmitters, displaying real-time tank pressure data alongside standard dive metrics on a 1.3-inch AMOLED screen with toughened glass. Depth rated to 120m, the Tern TX is tested to EN engineering standards for dive computer compliance.

The computer supports five dive modes: Air, Nitrox, 3-Gas Nitrox, Gauge, and Freedive. It does not include mixed-gas technical or closed-circuit rebreather modes, which remain the domain of the Perdix 2, Teric, and Petrel 3. Charging is via USB-C wireless induction, with a rated battery life of up to 20 hours of dive time per charge. The unit includes a customisable vibration alert system and Bluetooth connectivity for dive log syncing through the Shearwater Cloud app, and it ships with Remora quick-connect bands and webbing straps for tool-free strap changes.

The Tern TX differs from the base Tern in two respects: transmitter compatibility and the addition of a built-in digital compass for underwater navigation. Both models share the same display, dive modes, depth rating, and charging system. Divers who don't need wireless air integration or a compass can save cost with the standard Tern. As with the base model, the Tern TX is positioned for recreational and entry-level diving; divers planning to move into full technical or CCR diving should consider the Teric, Perdix 2, or Petrel 3 instead.