Choosing between dive computers and instruments starts with a setup question rather than a model question: do you need wireless air integration, a compass console, a wrist computer without air integration, or a 55mm computer package? These four used choices cover those paths, with a $599.99 spread between the lowest and highest listed prices. The useful shortcut is to match the feature that matters most, then weigh condition and package contents.
Quick take
The Shearwater Teric with transmitter is the direct match for wireless air integration. The Aqualung i330R combines a 2-gauge console and compass. Shearwater Teric Dive Computer Black 55mm emphasizes a 55mm case, silicone band, charger, and case, while the original Shearwater Perdix is a wrist computer marked NO AI. That leaves a clear choice between integrated air data, compass use, wrist format, and the lower end of the listed-price range.
Listed-price comparison
The spread is $599.99 from the lowest to highest listed price. The bars indicate relative price position within this group.
| Product | Listed price | Price position |
|---|---|---|
| Shearwater Teric Dive Computer Black 55mm | USD 624.99 | |
| Shearwater Teric Dive Computer w/ Air Integration Transmitter, Charger | USD 899.99 | |
| Shearwater Perdix Wrist Dive Computer - Black - Original OG, NO AI | USD 500.00 | |
| Aqualung i330R 2 Gauge Scuba Dive Computer Plus Compass | USD 300.00 |
Decision matrix
- Wireless air integration: Shearwater Teric Dive Computer w/ Air Integration Transmitter, Charger; its title names the transmitter, and the package includes it.
- Compass in the package: Aqualung i330R 2 Gauge Scuba Dive Computer Plus Compass. The transmitter-equipped Teric also names a digital compass, so compass capability alone does not separate those two.
- 55mm case and silicone band: Shearwater Teric Dive Computer Black 55mm.
- Original wrist format without AI: Shearwater Perdix Wrist Dive Computer - Black - Original OG, NO AI.
- Lower listed price: Aqualung i330R 2 Gauge Scuba Dive Computer Plus Compass.
Product notes
Shearwater Teric Dive Computer Black 55mm
Shearwater Teric Dive Computer Black 55mm makes sense for a diver who wants a 55mm case, silicone band, genuine charger, and case in one Teric package. Multi-gas decompression is also identified, and Android is named as the compatible operating system. That gives the used computer a specific configuration for someone who wants a Teric without the transmitter package. The limitation is its included contents: the named package does not include an air-integration transmitter or compass, and accessories not listed are excluded. Choose it for the 55mm Teric setup, not when a transmitter is the deciding requirement.
Shearwater Teric Dive Computer w/ Air Integration Transmitter, Charger
Shearwater Teric Dive Computer w/ Air Integration Transmitter, Charger is the direct match for wireless air integration because the transmitter is named in the title and included package. It also brings a full-color AMOLED display, digital compass, Bluetooth connectivity, wireless rechargeable battery, audible and vibration alerts, and a stated 200 m / 660 ft depth rating. The package therefore combines several named functions in one setup. The trade-off is the group's highest listed price and its used condition. Pick it when the included transmitter matters more than keeping the purchase toward the lower end.
Shearwater Perdix Wrist Dive Computer - Black - Original OG, NO AI
Shearwater Perdix Wrist Dive Computer - Black - Original OG, NO AI is for the diver who specifically wants the original Perdix wrist format without air integration. It has 54 dives and was used as a backup for tech diving, while the title identifies the OG, no-AI configuration. The limitation is condition: scratches are reported on the housing, the screen protector is scratched, the buckles have only one arm on the male end, and the package is the computer alone with no box. Choose it when the wrist format matters and those wear and strap issues are acceptable.
Aqualung i330R 2 Gauge Scuba Dive Computer Plus Compass
The Aqualung i330R 2 Gauge Scuba Dive Computer Plus Compass fits a buyer who wants a PSI dive computer paired with a compass in a 2-gauge console. It also names a bright color screen, rechargeable battery, four modes, three nitrox mixes, and Bluetooth. The limitation is its used condition and minor cosmetic signs of use on the console, although the components are said to function as intended. Choose it when the compass-and-console combination is the priority and the listed price matters more than the transmitter-equipped Teric package.
Final recommendation by use case
- Wireless air integration: Choose Shearwater Teric Dive Computer w/ Air Integration Transmitter, Charger, because the transmitter is part of its named package.
- Compass plus console: Choose Aqualung i330R 2 Gauge Scuba Dive Computer Plus Compass for the explicitly named 2-gauge and compass combination.
- Original wrist format without AI: Choose Shearwater Perdix Wrist Dive Computer - Black - Original OG, NO AI, provided its described wear and buckle condition fits your plans.
- 55mm Teric setup: Choose Shearwater Teric Dive Computer Black 55mm for the stated case size, silicone band, charger, and case.
If two paths still fit, use the table as the tie-breaker: the listed-price span runs from $300.00 for the Aqualung to $899.99 for the transmitter-equipped Teric, with the two other entries between them. Price can settle the choice, but it does not by itself establish better diving capability.
