Shearwater Peregrine vs Teric: Which One to Buy

The Peregrine and the Teric run the same decompression model, and on a recreational open circuit dive with matched settings they will display the same no stop time to the minute. Everything you are paying the difference for sits around that shared core: technical modes you may never switch on, tank pressure on the wrist, an alert you can feel rather than see, and a case small enough to wear to dinner. Whether that is worth roughly 619 dollars is a question about your diving, not about the firmware.

What is actually different between the Peregrine and the Teric?

Start with what is the same, because it is most of the important part. Both units run Bühlmann ZHL-16C with user set gradient factors, both accept nitrox to 100 percent, both have a full colour screen, and both charge wirelessly rather than opening for a battery, which removes the most common way a dive computer floods. Both use the same two button Shearwater interface, so a diver who knows one knows the other.

The differences are the technical feature set and the physical package. The Shearwater Research Teric Dive Computer adds trimix and closed circuit support, optional air integration for up to two Shearwater transmitters, optional VPM-B as an alternative decompression model, vibration alerts, a 200 m depth rating and a freedive mode, all in a watch sized case. The Shearwater Research Peregrine Dive Computer is a deliberately recreational unit: air, nitrox, three gas nitrox and gauge, no air integration at all, a 120 m depth rating, and a larger body with larger digits.

That is the whole comparison. There is no hidden difference in how safe either one is, no better sensor in the expensive one, and no penalty for buying the cheaper unit other than the features it does not have. Shearwater does not run a good algorithm on the flagship and a compromised one below it, which is unusual in this category and is a large part of why the brand is trusted.

Full specification pages for both sit at the Peregrine entry and the Teric entry, where any figure we could not confirm against the maker's own published specification is omitted rather than guessed.

Do they give you the same no stop times?

On an open circuit recreational dive with the same gas and the same gradient factors, yes. Both units implement Bühlmann ZHL-16C, and both let you set the low and high gradient factors yourself rather than hiding conservatism behind a three position dial. Two divers side by side, one on each, with matched settings, will see matched numbers.

Gradient factors are the part worth understanding before you buy either. They are a pair of percentages that decide how close to the theoretical limit the model will let you get, at depth and at the surface. A diver who sets them conservatively gets shorter no stop times and longer ascents than one who does not, on exactly the same hardware. The number on the screen is a model output shaped by a setting you chose, which is a very different thing from a measurement.

The Teric adds optional VPM-B, a bubble model with a different theoretical basis that generally produces deeper early stops on decompression dives. This is a technical diving choice, made with training, and it is not something a recreational diver should switch on out of curiosity. If the difference between models is the part you find interesting, the algorithm comparison covers how much two computers can legitimately disagree on the same dive.

How much does air integration change the decision?

More than most people expect, because it is the one capability the Peregrine cannot be upgraded into. The Peregrine cannot take a transmitter at all, so the comparable air integrated Shearwater is the Peregrine TX. Adding a Shearwater Research Swift Transmitter to a compatible unit is roughly a 445 dollar accessory, and you need one per cylinder you want to read.

What you get for it is tank pressure and dive time in a single glance, and on Shearwater units a gas time remaining figure derived from your recent consumption. What you do not get is permission to stop carrying a submersible pressure gauge. Transmitters drop out, batteries die and pairing occasionally fails, and a mechanical gauge cannot do any of those things. Air integration is a convenience layered on top of a backup, not a replacement for one.

If air integration is what you want and technical modes are not, the interesting option is neither of these two units. A Shearwater Peregrine TX keeps the recreational feature set and adds an AMOLED screen with transmitter support, and a Shearwater Research Tern TX Dive Computer does the same in a smaller case. Both sit between the Peregrine and the Teric on price, and both make more sense than buying a technical computer for a recreational reason.

Does the watch sized case matter?

It matters in two directions and divers weigh them very differently. The Teric is small enough to wear as a daily watch, which means you have it with you, you keep the charge topped up, and you log dives because the computer is on your wrist rather than in a bag. Divers who want one device rather than a piece of dive kit genuinely value that.

The cost is screen area. The Peregrine is physically larger with larger digits, and legibility at arm length in poor visibility is the thing it is best at. Divers who wear reading glasses on the surface should hold both before choosing, because a screen you have to squint at during an ascent is a real problem rather than a preference. This is also why several technical divers who own a Teric still put a Shearwater Perdix 2 Ti Dive Computer on the other wrist for the big dives.

Fit under a suit is the other practical difference. A watch sized case sits more comfortably under a drysuit cuff, and a large wrist unit is easier to read but harder to place. Neither is universally right, and the answer depends on what you dive in.

How do charging and battery logistics compare?

Both units charge wirelessly rather than opening for a battery, and that is a bigger deal than it sounds. A battery hatch is the most common way a dive computer floods, because it is a seal a diver opens and closes with cold hands on a boat, often with salt or sand on the o-ring. A sealed case that charges through the back removes that failure mode entirely, and it is one of the reasons both of these computers have a reputation for lasting.

The cost is charging discipline. A rechargeable computer that has sat in a bag since your last trip is a computer you have to remember before a dive day rather than after it, and the charger is one more thing to pack. Divers who travel to remote destinations sometimes prefer the opposite trade, which is why the Shearwater Perdix 2 Ti Dive Computer runs on a single AA you can buy in a village shop and change on a boat deck. Neither of the two computers on this page offers that.

The Teric's watch sized case has a practical advantage here. Because you wear it daily, it tends to be charged, whereas a large wrist unit lives in a gear bag between trips and gets forgotten. That is a real behavioural difference rather than a specification, and divers who log more dives on a Teric usually do so because the computer was on their arm rather than because the firmware encouraged them.

Where do these two sit in the rest of the Shearwater range?

Shearwater's range is unusually coherent, which makes the ladder easy to read. At the recreational end the Peregrine is the large screen unit without air integration, and the Shearwater Peregrine TX is the same computer with an AMOLED screen and Swift transmitter support. In a smaller case, the Tern is the compact recreational unit and the Shearwater Research Tern TX Dive Computer adds transmitters to it.

At the technical end the Teric is the watch sized option, and the Perdix line is the large screen one. A Shearwater Perdix 2 Ti Dive Computer uses a transflective colour LCD and a user replaceable AA, and a Shearwater Perdix 3 Dive Computer swaps that for an AMOLED screen and a rechargeable battery. Both have the technical feature set the Teric has, in a body that shows more and costs less.

That structure means the honest answer for a lot of divers is neither of the two computers in this comparison. If you want air integration without technical modes, the TX units are the sensible middle. If you want technical capability and do not care about wearing the computer to work, a Perdix gives you more screen for less money. The Teric exists specifically for divers who want the technical feature set on a normal sized wrist, and it is priced accordingly.

What does neither computer do for you?

Neither one measures anything about your body. Both track depth and time and run a model, and the number on the screen is an output of that model shaped by settings you chose. Two divers on identical profiles can surface with different numbers and both be following their computers correctly, which is why the more conservative computer in a buddy pair sets the dive.

Neither one reads tank pressure on its own. The Peregrine cannot at any price, and the Teric needs a transmitter per cylinder. Whichever you dive, you need a way to read gas that does not depend on a wireless link, and a mechanical gauge is the cheapest reliable answer.

And neither one extends your certification. Both units will happily display a decompression obligation, and running one is a trained discipline with its own equipment requirements rather than something a computer unlocks. Gear never substitutes for training, and a computer that can calculate a dive you are not qualified to do is not an invitation to do it.

Which one should you buy?

Buy the Peregrine if you dive open circuit recreational profiles, you want a configurable decompression model you can understand rather than a black box, you value screen size and legibility, and you would rather spend the difference on a regulator, an exposure suit or a week of diving. For most divers buying one computer for the next decade, this is the correct answer and the money left over is not a consolation prize.

Do not buy the Peregrine if you want tank pressure on the wrist, since it cannot be added later at any price, or if you already have a technical course booked that requires trimix or closed circuit support. Buying it in either of those situations means buying twice.

Buy the Teric if you dive trimix or closed circuit, you want air integration with up to two transmitters, you benefit from a vibrating alert because you dive task loaded with a camera or students, or you specifically want a computer you can wear off the boat. It is a genuinely excellent instrument and the features are real.

Do not buy the Teric if you are a recreational diver buying it because it is the expensive one, or if you have any difficulty reading small displays. Paying $1,100 to $1,300 for trimix and closed circuit modes you will never enable is the most common overspend in this category, and the screen size trade is one you live with on every dive rather than on the one dive a year that needs the features.

Either way, understand the settings before you dive the computer. A dive computer is an instrument that displays a model, and it does not make anyone safe on its own. The dive computer guide covers what the settings mean, and the dive computer roundup puts both units against the rest of the market by tier.

Deciding on a specific model? We review the Shearwater Research Peregrine dive computer review in full.