This equipment works great and is very easy to use. I like having my own meter to test nitrox tanks.

I wad excited to get this thing for my shop. I was looking forward to having my students use it in class and on our trip to St. Croix.This one was stuck on 21. No matter what, it would stay at 21. I disconnected everything from the boards with no change. It would not calibrate.I called the company and was told no one would be able to help me until after Thanksgiving weekend. It was Black Friday.I started researching probable causes which lead me to other reviews on Scubaboard and other places. It seems that these things just aren't very good. From being inoperable to being notoriously inaccurate even with new sensors, they just don't seem to be a good option.It also seems that they don't take returns. Thank God I bought the thing on Amazon.Hopefully they figure it out.It seems the best option is the Dive Soft unit but you have to have it linked to your phone because that unit doesn't have a screen.I have my divers test every bottle no matter if they think it's air. Screwing with a phone is too fiddly.Let mebknow if you guys get all this figured out.

Very accurate, within .2 of dive shops equipment reading. Calibrated with air tank before taking measurements. Tested 35 tanks on a recent trip. Very satisfied. They could make carrying case a little stronger.

Setting the zero is easy! Fast response time (imo).Measured 32% mix easy & quick to stabilize.No auto off, so do not forget to turn it off.User replaceable sensor battery and size of display sold me on this one.

I got this for my daughter, the diver, since it’s always good to be able to see what you’re looking at.She requested a different variety which is no longer manufactured. The guy in the dive shop suggested this so I got her the Nuvair.And while she is small, but mighty, she asked me to return it because there is already so much heavy stuff to wear.If anyone has a suggested brand, I’d like to know it.

Easy to use. Durable and accurate. Highly recommend this product so far. Price is very reasonable for quality and function.

A lil bit of context first. After 2-3 yrs of usage for my tech dives, my Palm O2 started giving readings which were off by 10-20%, it was obvious that the time has come to buy a new oxygene analyser. At some 100 usd, plus minus, Palm is dirt cheap but you can not replace the sensor which means you must throw the thing away and as an environmentally minded person, I just hate thrashing anything of which 99% is still perfectly good to go. Palm, that is just gross in 2021!I was thinking about Divesoft analyser, which would future-proof me for ANY diving which me, my children or children of my children might possibly do in future. But it costs north of 1000 usd and given the curve of cost of helium, who knows if any of our gang is going to ever need it.I once saw Nuvair in a dive shop and the pure geometrical shape plus the robust metallic build felt refreshing after years of seeing (and touching) all those plastic and more "organic" shapes.The product is robust, actually it is slightly bigger and heavier than what I both remembered and what it felt to be from the pictures. (I am not the type who would compare all specs of all products - if I were, I would hv known beforehand, mea culpa. But since i usually drive to dive sites by car, the weight is not an issue for me. I am mentioning that just in case anyone wanted as light analyser as possible for air travel, they better DO their homework and probably still get that eco-unfriendly, yet also lighter Palm O2.) The good thing about the size of Nuvair: no matter how thick your gloves might be, you will always have a good grip.Usage is simple, you turn the thing on by a rugged knob which is easy to operate even in thick gloves because apart from being rugged, it is also the biggest knob I have ever seen on an oxygene analyser. You then keep turning the knob further for calibration, so all possible operation of the device is being concentrated to one control, which is both practical and cool.The important thing for me and the major point of this review is that it works exactly as advertised. During recent 3 weeks of almost daily usage, I have not had any issues w measurements itself, they all fell within 1% of other analysers we got on our dives (Analox and Palm O2) on EAN up to 50%. I will test it against Trimix analysers and over 50% O2 in the coming weeks. (A sidenote: unlike the other commenters, I do not think that 1 or even more % difference in reading would make any big difference in Nitrox diving for which such an analyser is typically used: if your gas were 51% then your PPO2 at 50m would be 1.581, which is safely within the recognised limits. For most divers, the biggest problem would not be hypothetical 1-2% difference in the reading but their usual - and very real - 5-10% imperfection of their buoyancy control. And last, as a certified gas blender I can say that, again the thing which might theoretically impact your readings much more would be how long time ago your tanks were mixed and what method of gas blending your dive shop used before you start analysing them.)So far 5* out of 5. Yet all roses comes w thorns and this analyser is no exception either. Personally I have two following comments. I would like to stress, that they are not related to actual usage or performance of the product, which as described above, is good.The first is that since the analyser is turned on by a mechanical switch the device - by definition - can not turn off itself automatically. (I assume it can not - i left it on and after 30mins, the display was still on.) I dont know how much energy a day or two of being turned on can drain, maybe nothing? Or maybe something - then HOW MUCH? I quickly made the habit of turning it off right after the measurment, but if you lend your analyser to other people, who are not familiar with it, they may forget to switch it off and then you have yet another small thing to think about and take care of.My second comment is abt the round (tubular) design. On one hand, i DO love it, it is super cool and one of the reasons why I bought it. But it loves to do what tubes love to do: it rolls. There is a lanyard which can prevent the analyser from running away at you on some nicely flat and (!) stable surfaces (let's say, a table at your home or in your garage), but is of no use on a boat or - otherwise negligibly slanted - bank which gets rocked as you assemble your gear, someone kicks into it etc. Some kind of square shape, a triangle (OK, i know, it did not work very very well for Neill Young the last time..), or better a "chainlink" profile (flat on two sides), that would be also great from design point of view, yet more practical in this respect.Or - a more simple solution requiring no change of present product: a square or flat box. Well, a spoiler: the round thing is neatly packed in a perfectly tubular box from soft plastic with the thread in the middle, and unlike the lanyard on the analyser, there is nothing what would stop the circular perfection from finding the closest point of escape from the shackles of gravity. Which, sadly, on the ship might easily as well mean NOB ("NUVAIR OVER BOARD!") situation.So these would be my two cents of substantial comments. The last one is not an issue, just my own personal preference: if I could have a choice, I might hv bought a mustard yellow or a sky blue one instead and I know my gf would definitely wanted chilli red one to match her ... well whatever. Yet at the moment, to my knowledge only the green as bright as freshly mowed lawn is available.

This was purchased to use as a separate verification of the Nitrox mix in the rented tanks that I use both at home and when I travel abroad to scuba dive. It is small, compact to pack, the screen is protected and it's easy to use. I measure gas flow of different types of gas mixtures as my occupation and was impressed with its accuracy and ease of adjustment with the included tuner. I would highly recommend this analyzer for home and travel.