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Analox : Picture 1 regular

About Analox O2EII Nitrox Analyzer

To correctly plan for nitrox diving, all nitrox divers need to know the gas mix in their tanks. Analox Sensor Technology offers a range of nitrox analyzers (also known as oxygen analyzers) as well as spares and accessories to assist any scuba divers looking to start nitrox diving. Quick and easy to use, the O2EII is splash proof, drop proof and is easy to transport when going on your annual dive holiday. The O2EII is robust and ergonomically designed to ensure a comfortable grip. The O2EII is small, portable and battery operated, meaning it can be taken anywhere.

As a diver, confidence in your mix means you can relax and enjoy your dive. Now you can check your tanks on the boat, making sure the tank you filled is the tank they hook up! The new Analox O2EII is designed to be a major step forward in diver safety. Building on the success of the Mini O2DII, the O2EII retains the same qualities but with many additional features. There are many O2 analyzers on the market, many of which will give you an accurate read on your Nitrox... what sets the O2EII apart is its absolute superior construction and design: drop it, kick it, bang it around, fish it out of the water, it will still give you the most accurate O2 read, be the most comfortable in your hand, and last far longer than any of its competitors. Analox value is in their quality.

The O2EII oxygen analyzer is designed to measure oxygen levels in the range 0.1 to 100% O2 for tank oxygen level verification. The O2EII is ergonomically designed and equipped with several features to ensure ease of use and reliability. The instrument has been designed to be held in the left hand to enable ease of use when checking your tank. It is fitted with a large digital display and operates from an internal temperature compensated electrochemical oxygen sensor. Power is provided by a 9V battery which will last for approximately 1 year before replacement is necessary. The O2EII will automatically switch off after 10 minutes to ensure battery life is not compromised if the instrument is accidentally turned on.

The O2EII is water and drop resistant. Designed specifically for the diving industry whether you may be a sport Nitrox, commercial or military diver where hostile environmental conditions are the norm not the exception. The O2EII is supplied ready to use, all you need to do is push in the EII adapter. The analyzer has an on button that also acts as a hold button to freeze the reading on the digital display. The O2EII has a typical accuracy +/- 1% of reading +/- 0.2% of O2, an operating temperature of 23°F to 122°F (-5°C to +50°C), a sensor response of 15 seconds to 90% of final reading, a resolution of 0.1% O2 and provides a 4-digit LCD display reading. Included with the analyzer are an owner's manual.

The Analox O2EII Nitrox Analyzer is commonly used for All Diving Applications, Cold Water, Extreme Depths, Nitrox, Professional, Recreation, Warm Water and more. The Analox O2EII Nitrox Analyzer is most used by customers who consider themselves to be a Advanced, Advanced Diver, Divemaster, Professional, Recreational Diver among others. The Analox O2EII Nitrox Analyzer is popular because customers like the following qualities of the Analox O2EII Nitrox Analyzer: Easy To Use, Functional, Improves Diving Experience, Lightweight, Solid Construction, Stylish.

Warranty Information

This product has a limited warranty of 36 months.

Analox O2EII Nitrox Analyzer Features

  • Analox O2EII Nitrox Analyzer
  • All Nitrox Divers Need to Know the Gas Mix in Their Tanks
  • Quick and Easy to Use
  • Splash Proof, Drop Proof and Easy to Transport
  • Portable Enough for Travel
  • Ergonomically Designed for Comfortable Grip
  • Small, Portable and Battery Operated
  • Analox Value is In-their-Quality
  • Large Digital Display
  • Operates from Internal Temperature Compensated Electrochemical Oxygen Sensor
  • Power 9 Volt Battery (expected life 1 year)
  • Automatically Switch Off after 10 Minutes
  • Designed Specifically for Diving Industry
  • Users: Sport Nitrox, Commercial or Military Diver's
  • Works when Hostile Environmental Conditions are the Norm Not-the-Exception
  • On Button: Acts as Hold Button to Freeze Reading on Digital Display
  • Measure Oxygen Levels in Range 0.1 to 100% O2
  • Resolution 0.1% O2
  • Typical Accuracy +/- 1% of reading +/- 0.2% of O2
  • Sensor Life Up to 4 years
  • Display 4 Digit LCD
  • Operating Temperature 23°F to 122°F (-5°C to +50°C)
  • Sensor Response 15 Seconds to 90% of Final Reading
  • Owner's Manual

Analox O2EII Nitrox Analyzer Customer Reviews Powered by TurnTo®

Review Summary


(based on 40 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


"Quick and Easy"

Quick, Accurate, Easy to use. I like that you dont have to put this analyzer together. It comes ready to use. It's so easy to use that you can take it on the boat and doubble check you mixture just before you dive.


Most Liked Negative Review


Not bad, but not the best

This analyzer does a great job, if you get everything right. First, gas flow must be dialed in at a very soft hiss. If you have smooth tank valves, you're in business. Otherwise, getting an accurate reading is nearly impossible. I'll keep searching for the ones I see in use in the Asian Pacific, which attach via a yoke and hose and appear to give much more consistently accurate readings. I'll recommend it, but with reservations.

Reviewed by 40 customers

Displaying reviews 1-5

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Excellent product


from Lake Almanor, CA, US

I bought this for use while vacationing so that my friends and I could analyze our nitrox tanks. Not only is it easy to use, but it works like a charm! A couple of my 32 tanks were really 33, and I'm so glad I was able to double check them. If you are going to dive nitrox then this is a must have.


Good choice


This is my first analyzer and by far a good choice.


Who do you trust with your own saftey?


from San Francisco, CA, US

I haven't used the one I bought, yet. I've used this model on many dive trips. I bought my own for those cases where it is difficult or inconvenient to wait to use the one analyzer on board or at the resort. Here's my point: in a couple thousand dives, I've been given unfilled tanks a half dozen times, had mixes off by more than 2% of stated and several other similar issues. Based on that admittedly limited sample, your odds on any one dive or even dive trip are pretty good. Is that good enough? The ONLY times I've every had a problem is when I, myself, failed to double check. 'nough said.


A must have for EAN dives


Arrived in great condition. Superior packaging container that can be used as a travel case until a suitable replacement can be obtained.


Good piece of kit!


Notthing really earth-shattering to say about this product other than it works and works well. Solid construction, super easy to use, lightweight, and I've found it to be very accurate as well. I'm a Gas Blender (Inst), so I play with quite a few different analyzers and like to compare them as well...the accuracy and ease of use of this particular one gets two thumbs up from me!

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Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  Why Did You Choose This?
BRIAN C  price
COPIOUS C  i like having my own analyzer to check my nitrox tanks. dive shop analyzers have been used so much...who knows how accurate they are or how well they've been maintained.
SUSAN S  Works well and travels well.
RICHARD W  This analyzer saved my dive trip to a remote destination. We were wreck diving and dive shop only had 1 analyzer. The line was an hour long. I pulled this out of my bag and we were on our way!
JAMES G H  Good value. Company has good reputation. Ease of use.
BEAU V  to analyze my own nitrox
BEN E P  Quick and easy set u p for Nitorx tanks
PHIL S  For use in teaching my classes on NITROX certification. It is the unit used by all the dive resorts currently
TIM M  "For gas analysis of our Nitrox tanks. This unit is the industry standard and every boat I have been on has had at least one. Works perfect time after time. I love it. highly reccommended."
Stephen W  Filters and how much ?
SUKANYA Y  No filter need in Nitrox Analyzer
STEVEN S  Don't know as I have sold the analyzer.
Shopper  How to replace battery?
FRED E  remove the 4 screws,take face off will see 9v battery unplug and replace very easy.battery will last for many years. if a problem it is the sensor that need replaced. It is also easy to replace
MARK B  Battery Replacement 1. Loosen the 4 screws located on the front cover. The gasket seal is designed to prevent water leaking into the O2 EII Pro as a result the seal may be tight. Loosen the seal by moving the lid from side to side, and then carefully lift the cover. 2. Slide the battery out of its holder and disconnect the lead. 3. Connect the lead to the new battery and slide the battery into its holder, under the battery clip 4. Replace the cover carefully taking care that the sensor locates properly, and that you do not trap any wires. Screw down until you feel the gasket tighten; do not over tighten the screws.
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