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Tusa Zen Air IQ-950 Is The Answer To All Your Diving Expectations

Tusa Zen Air IQ-950 Is The Answer To All Your Diving Expectations

Tusa ZEN Air IQ-950 is wireless air-integrated high-tech dive computer that may suit to advanced and technical divers. With support up to 3 Nitrox mixes and having 4 dive modes this instrument has very competitive price and quite popular among divers!

General Information
User Interface
Your Review



Tusa Zen Air IQ–950 is high-tech instrument and can be recommended dive computer for advanced and technical divers, but may be considered as a first dive instrument by those newbies who want to progress in diving career fast and want to buy dive computer that has all-in-one features.

Zen Air is a further development of IQ–900 Zen dive computer from Tusa. Naturally IQ–950 gains some key features from its predecessor and at the same time it receives several complete brand-new functions of its own.

Main differences are: hoseless air-integration and possibility to pair up to 3 transmitters, included PC cable interface into the package, few new types of alarms and display layout, regarding to air-integration.

In July 2010 Tusa made an upgrade to IQ–950 Zen Air to improve performance, so you may check out Tusa web-page to download this thing.


Tusa ZEN Air IQ-950 Features Card

Copy this Tusa ZEN Air IQ-950 Key Features & Alarms Card for your Reference and Share with your friends and buddies!


Above mentioned alarms are for Air and Nitrox dive modes, Freedive mode has its own alarms and we will discuss them later below.


  • you will quickly appreciate all functions and elegance of this advanced and multifunctional dive computer;
  • you will get wireless air-integrated dive computer with possibility of 'Buddy Pressure Check" function;
  • you may practice technical diving and freediving, as Tusa ZEN AIR IQ-950 dive computer covers those activities;
  • you will get PC cable interface included, so can start uploading settings right away;
  • you will have the instrument that works well underwater as dive computer and in office or restaurant as a digital wrist watch;
  • you will be able to change battery yourself and keep settings safe with data retention feature








User Interface
4 buttons
Dive Modes
Air, Nitrox, Gauge, FREEdive
Standalone Digital Watch
Buhlmann ZHL – 16C
Number of Gas Mixes
Mix 1- Air, 21% - 50%; Mix 2 & 3 - Air, 21% - 99%
1.2 - 1.6 ATA
Air Integration
Safety Stop (SS)
Deep Stop (DS)
Conservative Factor
Altitude adjustment
Gas Switching
Dive Planner
9 - 57 meters
Logbook Capacity
24 most recent dives
Max Operational Depth
100 meters
Backlight duration
0/5/10 sec
Sampling Rate
2/15/30/60 sec
User Replaceable Battery
Data Retention
PC Interface
2 years










Tusa Zen Air IQ–950 inherited from its predecessor 4 control buttons: Mode, Advance, Select, Light. Certain button combinations will allow us to step back to the menu hierarchy – that’s a great timesaving benefit for us!

Display has almost the same layout except extra new values regarding to air-integration, like Air Time, cylinder pressure, wireless transmitter icons.


Tusa Zen Air IQ-950 has 3 bar graphs that are similar to IQ-900 model – Nitrogen Loading Bar Graph (NiBG), Oxygen Bar Graph (O2BG), and Ascent Rate Bar Graph (ASC). That’s all pretty intuitive and obvious:

  1. NiBG shows graphically level of nitrogen loading by adding and subtracting segments, if you have full set of segments – No-Decompression dive becomes Decompression dive;
  2. O2BG is a graphical representation of oxygen toxicity level and it works the same – adding and subtracting segments – with full bar you will get a High O2 alarm;
  3. ASC displays certain number of segments according to speed of your ascent, and if diver ascends faster than allowable maximum – dive computer will display message SLOW and audio alarm goes on


Display has main and alternative screens, so you need to press ADVANCE button to move between them to view additional dive data.







This is a setting time and we are going to adjust our Tusa Zen Air IQ-950. All parameters are divided to certain groups similar to IQ-900 model. Diver is able to set fully functional digital watch, number of parameters for dive modes, alarms, and utilities.


Tusa ZEN Air IQ-950 Settings Card

Copy this Tusa ZEN Air IQ-950 Fine-Tuning Card for your Reference and Share with your friends and buddies!


Also Tusa Zen Air IQ-950 has Dive Planner that calculates and shows our No-Decompression times for certain depths according to nitrogen and oxygen loading from previous dives (if any). This function works only for Gas Mix 1. Even if you enabled two other mixes – it will not make any effect on calculations.







We set Wet Activation to ON and when dive computer senses depth of 1.5 meters it will activate dive mode.


Tusa ZEN Air IQ-950: Diving With Air & Nitrox

Below is a summary of dive data regarding to No-Decompression conditions and diving with Nitrox from main and alternative displays:

  • No-Decompression (NDC) Time Remaining;
  • Elapsed Dive Time (EDT);
  • FO2 and PO2 for gas selected;
  • Cylinder pressure;
  • Air Time Remaining (ATR);
  • applicable icons;
  • NiBG, O2BG (if applicable), ASC (when ascending)
  • current depth;
  • max depth reached during a dive
  • temperature;
  • time


As we set Deep and Safety stops to ON before, Tusa ZEN Air IQ-950 may give as prompts upon reaching certain conditions. Stop depth and time will be displayed to help you manage those situations safely.
Deep and Safety stops are recommended and diver is not obliged to complete them. If you miss stops – there is no penalty time applied.


Safety Stop prompt used to show depth of 4.5 meters before, but now with new upgrade from Tusa Safety Stop depth will be 5 meters.

Tusa Zen Air IQ-950 allows us to swap gas mixes during a single dive if we enable them, of course. It has the same feature as Tusa Zen IQ–900 has: if there is not enough gas in your cylinder to finish a dive and you switch to gas mix with prohibited PO2 – you will be allowed to do this.

The most convenient functions of Tusa Zen Air IQ-950 is hoseless air-integration and possibility to observe Air Time Remaining according to our air consumption, Cylinder pressure, and set of alarms – Air Time Remaining alarm, Turn Pressure alarm and End Pressure alarm.


If you dove with air-integrated dive computers before – you may know how Air Time Remaining alarm works, but if not – here is a brief explanation.

If we take Suunto air-integrated models for an example – they have preset Low pressure alarm for 35 bar. And when calculated Air Time Remaining becomes ‘zero’ and alarm goes on – it means that there is still enough pressure for you to reach surface safely and that pressure is 35 bar.

The same happening here, but in this air-integrated dive computer you may set your own desired pressure and this is End Pressure alarm set point. See, logical and easy and we are safe!


If we exceed our No-Decompression Limits (NDLs), Tusa Zen Air IQ-950 activates Decompression mode. You will hear an audio and applicable dive data will be displayed when decompression mode activated. From this moment all calculations will be made regarding to Deco mode.

Below is a summary of information displayed in regards to Decompression mode:

  1. bar graphs: NiBG, O2BG (if applicable);
  2. Total Ascent Time (TAT) – time required to reach surface safely;
  3. Stop Depth and Stop Time;
  4. current depth;
  5. max depth reached during a dive;
  6. cylinder icon of gas in use;
  7. applicable icons and values for air-integration functions;
  8. time;
  9. temperature, etc.


Tusa ZEN Air IQ-950: Diving In GAUGE Mode

Next Dive mode of Tusa Zen Air IQ-950 is Gauge. Zen Air doesn’t perform any calculations of nitrogen and oxygen loading during this dive mode. It can be used as a depth gauge and depth timer only and in addition it will show us cylinder pressure, Air Time Remaining (ATR), and we may swap gas mixes as well.

Display shows dive data similar to listed below and it is a summary from main and alternative displays:

  1. current and maximum depth;
  2. time and temperature;
  3. cylinder pressure;
  4. Air Time Remaining;
  5. Elapsed Dive Time (EDT);
  6. ASC (is ascending)


Tusa ZEN Air IQ-950: FREEdiving

FREEdive mode is similar to Tusa Zen IQ–900 and it has similar set of alarms and functions. Before freediving with Zen Air we may set following alarms:

  1. Freedive Elapsed Dive Time (EDT) - ON/OFF, and factory preset for 30 seconds, that means, if ON – you will hear an audio after every 30 seconds elapsed;
  2. Freedive Depths alarms – possibility to set 3 depth alarms at progressively deeper depths at range 10 – 100 meters with 1 meter increment;
  3. Freedive Countdown Time (CDT) alarm – audio goes on, if CDT timer reaches ‘zero’


During freediving Tusa Zen Air IQ-950 displays following dive data:

  1. NiBG (if you have any level of residual nitrogen from previous dives);
  2. No-Decompression (NDC) Time Remaining;
  3. Elapsed Dive Time (EDT);
  4. current and maximum depth during a dive;
  5. time and temperature;
  6. Countdown Timer (CDT) status


Upon reaching certain conditions dive computer will give you alarms that were set before, including NiBG alarm.

Nitrogen loading is calculated between this freedive and previous dives. So, if you have residual nitrogen and its level will reach Cautious zone – dive computer will warn you about that, and there is more – if Nitrogen level increases to Decompression level – dive computer will activate Violation Gauge Mode (VGM) for 24 hours and you need to stay on surface without any diving activity for entire period of 24 hours.


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Post diving functions of Tusa Zen Air IQ-950 are similar to Tusa Zen IQ–900 and I gave brief descriptions of them below:

  1. Plan mode – this function allows us to plan next dives for Air and Nitrox and calculates our No-Decompression (NDC) times according to residual nitrogen and oxygen remaining from previous dives; it works only with 1st gas mix, even if 2nd and 3rd gas mixes were enabled – it doesn’t make any effect on calculations; it shows us available times for depth at range 9 – 57 meters;
  2. No-Fly Time Counter;
  3. Desaturation Counter;
  4. Logbook mode for Air, Nitrox and Gauge – shows information about the most recent 24 dives and has 2 pages of extensive dive data;
  5. History mode – stores dive data of 999 Air, Nitrox and Gauge dives, 9999 dive hours, and maximum depth reached;
  6. PC upload and download dive data (PC interface cable is included in package)


For Freedive History and Logs we need to use PC interface cable and Tusa Dive Manager Software to transfer freedive data to computer for viewing and organizing.







Tusa ZEN Air IQ–950: What Divers Say


  • excellent dive computer with air-integration feature and added safety features;
  • good support from manufacturer;
  • easy to set and use dive computer after you learn manual;
  • recommended dive computer not only for advanced recreational divers, but also for the beginners in diving



  • lacking integrated compass


I may say that Tusa produced its first air-integrated dive computer and it is nice addition to our market. This scuba dive gear has its own personality and we didn’t find any problems with it. Wireless was always steady and functions related to it worked well!


Tusa ZEN Air IQ-950 dive computer
Tusa ZEN Air IQ-950

Dive-Computer-Wizard Rating
golden star golden star golden star golden star golden star


You may consider Tusa Zen Air IQ-950 as primary dive computer whether you are beginner, who is not afraid to start with high-tech stuff, or technical diver. This dive computer suits well both and you won’t get wrong with it!



Add comment
Akemi, 23 November 2013 14:27
Tusa Zen Air With Very Reliable Air Integration

I'm a technical diver and using Tusa Zen Air for more than 4 years already. I'm more than pleased with its wireless air integration. It makes me more confident underwater when I see my air consumption and dive time left on display.

Switching between tanks is easy task, and everything regarding to wireless works perfectly. Tusa Zen Air hardly ever lost its wireless.

User manual could be better organized, so it maybe difficult to figure out things by novice diver.

Rik, 12 May 2011 08:41
I Have Never Expected Such An Exceptional Performance From Unknown Tusa Zen Air!

I was looking for sometime to upgrade my Suunto Stinger for something new. I am a bit geezer, so I was always longing for something unusual that nobody had! And I opted for Tusa Zen Air IQ-950 after quite extensive research.

I was very surprised with the elegance and functionality of this dive watch computer. Support for 3 Nitrox mixes, wireless air integration that I have never lost, 4 dive modes...

After having Tusa Zen Air I started even freediving! I couldn't ever see myself freediving before! This computer really pushes me to the limits! User manual a bit confusing to follow at the start, but after few times reading and learning the interface and what to expect - I was pretty confident. It was good learning curve for me!

I like display with big digits with good contrast and bar graphs that show me nitrogen and oxygen loading and ascent speed. Display is easy to read, it is pretty intuitive. If I go technical - switching between gases is very easy procedure.

Also wireless is excellent! With my transmitters installed I get tank pressure and Air Time Remaining display, which is really great - I know precisely of how much bottom time I have.

I have never regretted because of my choice and investment!

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