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So what's on the market in terms of handheld CO testers these days? People who bother to test their air, what are you using? I've always been surprised that this isn't standard. The shops I frequent are all very buttoned-up operations but none of them do this and don't seem to think it's...

GÜÉ in europe

I wrap mine once around my arm, or even better make a loop held to size with a couple of zip ties that slides over the top of the dil tank.

Other than cells and some types of batteries the unit should be fine in cold storage. If mice are a possibility I would be more worried about that than temperature.

Never. If I'm going to dive in the dark (night, caves, wrecks) i feel that it is important to experience the dark as it was meant to be. Without a light.

there should be a cert course + card for unattended boat diving just like there is for solo or deep air, would add much safety :stirpot:

I recommend redundant bilge pumps, properly wired and plumbed, with reliable charged batteries. I once came up from a dive to find our 17 foot skiff sinking to the point that the engine was almost under. In very cold water with increasing breeze and waves blowing away from shore. Or more...

When I use AI I always have a backup SPG. I have had frequent dead batteries in AI transmitters. Accidentally leave it pressurized for a day or two = dead battery = dammit no AI. On doubles I run the transmitter and SPG on different posts.

Paywall broken for your convenience:

This is all feasible. The problem you'll run into is how difficult it is to speak clearly with a reg in your mouth. This likely requires a full face mask, or a reg with a custom cup-style mouthpiece. Or it may be possible to train in some alternate enunciation techniques like ventriloquists use...

Hats off to you! I tried. That's an achievement!

This thread needs @Akimbo insight

There's literally nothing (yet) to suggest this was a bad air incident. The only details we have are that there were two divers, one if not both aged in their 70s, out on a coldwater dive to test gear before a trip. Any number of things could have gone wrong.

Would you want to learn from an instructor who had only been diving 100 times before? I wouldn't. Like others have said you need to log more dives before teaching. Sure you could do it on paper. But without more experience to draw on you'll be a crappy teacher unable to handle questions or...

https://www.pyroscience.com/en/products/all-meters/fdo2

The vintage classic would be steel 72s. Steel 50s make nice small doubles too. In any case you'll need to find tanks and bands that correctly fit the spacing on your manifold.

Interesting thought. As far as I know galvanic cells are FAR less annoying when they're not being pushed in the extreme operational environment of a rebreather. That is to say, they are significantly more reliable and longer-lived in lower humidity, lower PO2 environments. There is a wide market...

resurrection is better than a new thread

Don't do dives with gas switches without training to do gas switches.

Where do we draw the line between true "in water recompression" versus surfacing with skipped deco but immediately returning to depth to finish it? When I think of IWR I picture a process undertaken perhaps tens of minutes to hours after a dive, after becoming symptomatic on the surface...