Best Dive Computers for Nitrox: Manage Gas Mixtures with Reliable Algorithms

Our Pick and How the List Was Built

Reliable gas management is the primary goal for any enriched air dive, requiring a computer that accurately tracks nitrogen absorption and remaining air time. A dependable interface ensures you can monitor your PO2 levels and decompression limits without hesitation during the dive.

The Garmin Descent Mk2i Titanium with Black Band provides the necessary reliability for these tasks, featuring integrated pressure monitoring on up to 5 tanks via SubWave sonar. For a dedicated technical platform, the Shearwater Research Shearwater Perdix 2 13301 offers superior depth capabilities, while the Shearwater Research Teric Color Wrist Dive Computer serves those seeking a versatile, configurable algorithm.

We screened 15 Scuba Diving Computers and compared 9 models here at Scuba Forge to select the best options for nitrox use. These selections cover a price range from $580 to $1110, with the median price of the 9 products in our comparison being $580.

Subsurface Computers for Nitrox: Price, Rating and Specs Compared

Prices are approximate and move frequently – check the current price before deciding. “Not stated” means the manufacturer listing does not give that figure – we do not estimate it.

Among our top picks, the Garmin Descent Mk2i Titanium with Black Band is the value leader at $8.75 per hour of battery life, which provides more endurance for long Nitrox dives.

Each Pick for Nitrox, Examined One by One

The 3 picks below are reviewed in the same order as the cards above.

Garmin Descent Mk2i Titanium with Black Band

This scuba diving computer made the list for nitrox diving because it provides high-end reliability and smart features for recreational divers who need a versatile, multi-gas capable device.

What we like: The device provides 80 hours of battery life in dive mode, which is a significant duration for extended underwater use. It also features Pulse Ox sensing for blood oxygen saturation and integrated pressure monitoring on up to 5 tanks via the SubWave sonar data network.

Keep in mind: The 1.4 inch display is smaller than some larger-format models, which may limit visibility for those who prefer a larger screen for reading complex data.

Shearwater Research Teric Color Wrist Dive Computer

We selected the Teric Color for its professional versatility and its specific focus on nitrox and trimix decompression diving in a compact wrist-watch form factor.

What we like: It utilizes the Bhlmann ZHL-16c algorithm, a calculation method used to determine safe decompression limits during a dive. The 55mm case diameter provides a large surface area for viewing information while maintaining a wearable profile.

Keep in mind: The nylon material construction is a different choice than metal housings, which may rule out users seeking a more rigid exterior.

Shearwater Research Shearwater Perdix 2 13301

The Perdix 2 is included for its elite technical capabilities, offering a high depth rating and extensive gas support for advanced nitrox and technical diving.

What we like: It supports a maximum operating depth of 260m, which is a significant depth rating for technical operations. The device also offers 100 hours of battery life when using Saft LS14500 batteries and can store approximately 1,000 hours of dive logs.

Keep in mind: At a price of $1,110, this is the most expensive option for those who do not require its advanced depth ratings or gas storage capacity.

Is it worth paying extra for a multi-gas computer vs a basic one?

Paying extra for a multi-gas computer is worth it if you need to switch between different gas mixes, such as different nitrox blends, during a single dive or across multiple dives. A multi-gas computer allows you to program different gas percentages and oxygen levels, which the data shows these models support through various gas counts. For a recreational diver who only ever uses one specific nitrox blend, a basic computer might suffice, but the extra cost of these models provides the flexibility to expand into technical diving or different gas configurations later.

Browse our top picks to see the best-rated models at a glance.

Compare all features side-by-side in the comparison table.

Use the buying guide to understand the key criteria for making your choice.

Get a complete breakdown of the Descent Mk2S spec analysis before you buy.

Research different budgets by looking at what scuba diving computers cost at each price level.

How to Choose a Scuba Diving Computer for Nitrox

Custom Nitrox gas percentage settings for scuba diving computers

You should choose a scuba diving computer that allows for custom Nitrox gas blending—the process of mixing oxygen and nitrogen to determine the correct oxygen partial pressure—to ensure you can program specific gas mixes. The Shearwater Research Shearwater Perdix 2 13301 supports 5 Open Circuit gases, providing the flexibility to input various oxygen percentages for different dive plans. The Shearwater Research Teric Color Wrist Dive Computer also supports Open-Circuit mode for Nitrox use, while the Garmin Descent Mk2i Titanium with Black Band provides a watch-style interface for managing these settings. Because the Shearwater Research Shearwater Perdix 2 13301 supports more individual gas types than the other options we compared, it offers the highest level of gas variety for technical divers.

Depth alarms for monitoring oxygen partial pressure limits

Prioritize a device with a reliable depth alarm—a safety feature that alerts you when you reach a specific depth—to stay within your oxygen partial pressure limits. You need to monitor these limits because of solubility, the principle of how nitrogen and oxygen are absorbed into your tissues at depth. The Shearwater Research Shearwater Perdix 2 13301 handles these calculations with a 260m maximum operating depth, providing a large buffer for recreational Nitrox limits. The Garmin Descent Mk2i Titanium with Black Band also monitors these factors, while the Shearwater Research Teric Color Wrist Dive Computer uses the Bhlmann ZHL-16c algorithm to calculate your limits. We found that the Shearwater Research Shearwater Perdix 2 13301 set these apart by offering the highest depth rating in our comparison.

Decompression algorithm accuracy for specific diving styles

Weigh the specific decompression algorithm against your diving style, as the math used to calculate your no-decompression limits must match your planned gas usage. The Shearwater Research Teric Color Wrist Dive Computer uses the Bhlmann ZHL-16c algorithm, which is a standard for many technical divers. The Shearwater Research Shearwater Perdix 2 13301 and the Garmin Descent Mk2i Titanium with Black Band use their own proprietary calculations to manage your bottom time. If you require a specific algorithm for your training, verify the model’s logic before you buy, as the data for the specific algorithm used by the Garmin Descent Mk2i Titanium with Black Band is not stated.

Multiple gas switching capabilities for Nitrox blend divers

Select a computer that supports multiple gas types if you plan to switch between different Nitrox blends during a single dive. The Shearwater Research Shearwater Perdix 2 13301 supports 5 Closed Circuit gases and 5 Open Circuit gases, making it the most versatile option for complex gas switching. The Shearwater Research Teric Color Wrist Dive Computer also supports Open-Circuit mode for switching. For a full day of diving, the Shearwater Research Shearwater Perdix 2 13301 provides up to 100 hours of battery life, while the Garmin Descent Mk2i Titanium with Black Band offers 80 hours in dive mode. The Shearwater Research Teric Color Wrist Dive Computer provides a 40-gram weight, making it a lighter choice for your wrist when managing multiple gas profiles.

See which model fits your specific diving style in our audience checklist.

Review the setup and warranty notes for information on initial configuration and support.

View the technical requirements to ensure the device meets your minimum safety standards.

Ensure your gear meets requirements by viewing scuba diving computer certifications and safety standards.

Each Job, What It Takes and How the Picks Do

Each row is a job this page’s buyers ask about, worked out from each pick’s listed maximum operating depth and a typical need for the job.

Each need is a typical figure for that job rather than a manufacturer claim, and the picks’ results come from their listed specifications. Where your job is bigger or smaller than the typical one, go by your own figure.

Who Buys Subsurface Computers, and What It Really Costs

Read the scope of this guide to see exactly which models are included.

Explore the detailed reviews for an in-depth look at each individual unit.

Getting Started with Any of These Picks

Power sources and accessories required for scuba diving computers

Each scuba diving computer requires a functional power source to operate. You must have a compatible charging cable to replenish the internal power source before you head into the water.

• The Shearwater Research Shearwater Perdix 2 13301 requires Saft LS14500 or Lithium 1.5V batteries; it does not use a rechargeable internal battery.
• The Garmin Descent Mk2i Titanium with Black Band includes a watch-style form factor that works with a Descent T1 transmitter (sold separately) for integrated pressure monitoring.
• The Shearwater Research Teric Color Wrist Dive Computer uses a nylon strap but does not list a specific required transmitter in the core specs.

You do not need to buy a separate transmitter for the Shearwater Research Teric Color Wrist Dive Computer, but you may need to purchase a Descent T1 transmitter for the Garmin Descent Mk2i Titanium with Black Band to access its integrated pressure monitoring on up to 5 tanks. Will you need a different strap for your wrist size? The Shearwater Research Teric Color Wrist Dive Computer includes a nylon strap, while the Garmin Descent Mk2i Titanium with Black Band uses a black band; you can choose a replacement strap to accommodate different sizes or materials.

Verifying your purchase on arrival

Warranty cover differs by seller and country, so you must verify the following details before your return window closes.

• Confirm the screen resolution matches the stated figures, such as the 320×240 resolution on the Shearwater Research Shearwater Perdix 2 13301, to ensure the display is not defective.
• Check that the case diameter is correct, such as the 55mm housing on the Shearwater Research Teric Color Wrist Dive Computer, as a mismatch can affect how the device sits on your wrist.
• Verify the device can perform a firmware update, which is necessary for maintaining software accuracy and latest decompression algorithms.

Perform a power-on test and check the basic interface menus the day it arrives while a return is still possible.

What Buyers Still Want to Know About Dive Computers for Nitrox

Which nitrox diving computer is best for deep technical dives?

The Shearwater Research Shearwater Perdix 2 13301 is the option for deep technical dives because it supports 5 Open Circuit and 5 Closed Circuit gases. This model reaches a 260m maximum operating depth, which is the deepest rating among the selections we compared.

What happens if the scuba diving computer freezes or the screen goes blank?

The scuba diving computer provides a watchdog timer, a fail-safe that automatically reboots the system if the software stops responding. While specific reboot times are not stated in the data, this feature ensures the device remains functional during a dive.

How does the Shearwater Research Teric Color Wrist Dive Computer handle gas switching?

The Shearwater Research Teric Color Wrist Dive Computer supports gas switching, which is the process of changing from one gas mix to another during a dive. It utilizes the Bhlmann ZHL-16c algorithm to manage these transitions for Nitrox or Trimix profiles.

Which enriched air dive watch should I buy for a 30m recreational trip?

If you need to dive to 30m for a recreational trip, the Shearwater Research Shearwater Perdix 2 13301 is the choice as it handles 260m. You can also use the Garmin Descent Mk2i Titanium with Black Band, which provides 80 hours of battery life in dive mode.

Who Should Skip These Scuba Diving Computers

The Shearwater Research Shearwater Perdix 2 13301 supports 5 Open Circuit gases and 5 Closed Circuit gases. This gas support allows you to program specific gas mixes for complex dive profiles. If you require a computer that manages more than five gas switches, this model does not meet that requirement as the specific count is not stated in the data.

If you require a device with a specific depth rating not listed here, you should look for a professional-grade technical computer. If you are looking for a different style of interface, see best watch-style dive computer.

If your work requires a depth rating beyond 260m or specialized gas mixing for more than 5 gases, these three picks are the wrong tool. These models are designed for recreational and standard technical nitrox diving and do not meet the requirements for extreme-depth saturation diving or heavy-gas-switching environments.