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I think they are used interchangeably by divers who actually use those terms on regular basis. Yes, I get that some posters have wondered if there is a difference, but in actual practice I've never, ever heard someone use "PO2" to mean anything other than PPO2.

Who does that? Maybe at the fill station someone might say "this one's got 100 bar of O2 in it" but if someone said here's a cylinder with a "PO2 of 100bar" I think we'd look at him like he had rocks in his head.

PO2 and PPO2 are used interchangeably by divers. The mantra of every CCR diver's training is "always know your PO2." The reference is not to the tank pressure of the O2 bottle. It means what is the partial pressure of oxygen in your loop.

Do you download your dives? You can probably, in retrospect, figure out your CNS loading for some of your past dive days giving credit the 90 minute half time, and also your cumulative OTUs. I can do that on Diving Log. I doubt you have a problem there, but it might be interesting. This...

If your takeaway of all this is that there's just no need to monitor or account oxygen exposure, then you've missed the point. If you don't want a computer with a different oxygen exposure algorithm, fine. You can check your dives and surface intervals on tables and figure half times and OTUs...

Because James Bond never strapped scissors to his calf. Seriously, I'm with you. I have a trilobyte on every BC/BP. That's fine for OW. If wreck diving, I'll also have shears and maybe the DGX titanium pictured above. If I spearfished, I guess there might be a need for a KNIFE!, but not...

+1 on "just unbolt it" between trips. My body will be corroded to uselessness before my AL backplate has any issues. However, being OCD myself, I am fully sympathetic to making it "PERFECT!". Many camera housings have little zinc anodes. Perhaps one of those would work. West Marine also has...

Find dive shops you like, find a club, go to meetings & meet some other divers. There are some classes you can take that don't require dives - nitrox, science of diving type stuff - but see if you can find a "diving home" in your new location. It's all a poor second best, but if you find some...

I've never heard about retinal detachment issues, but hyperoxia induced myopia is well documented. I have a friend who has experienced after multiple days of diving his CCR at a 1.3 setpoint and now mostly dives at 1.2 to avoid it. I've not heard about for OC divers, but I haven't read the...

I wouldn't go so far as to say it was the correct decision. As it turns out, your CNS O2 exposure was likely within limits of different methodology than your computer was using, but you had no way of knowing that at the time because unlike Scubadada, you didn't have another computer you knew...

The Divesoft analyzers offer 1, 2 or 3 point calibration. Three point uses air, 100% O2 and a third gas with 0% O2. The analyzer also measures barometric pressure and temperature and uses a flow limiter. It's pretty slick. I agree that for most diving it is not required but extremely deep...

For calibration, there are a couple of issues going on. One, as mentioned, is linearity. The cell merely generates a voltage based on a galvanic reaction when exposed to O2. More O2 = more voltage. In a healthy cell, the response is mostly linear, but not perfectly. The analyzer is assuming...

Just don't think about it. Seriously. I've done six million air share drills in various classes, almost all primary donate. It's a little gross if you dwell on it, I admit. So don't dwell on it. Give it a little swirl in the water before you put in your mouth and tell yourself you washed...

Clean them up however much you want. If it's just a few little nicks, a couple of coats of nail polish works fine. Useful when you get them hydro'd to protect the stamped area. No need to do anything dramatic.

Wow. "Backwards"? That commentary pretty much speaks for itself & is pretty offensive. Given that, I doubt any objective information will change your mind. Sorry to challenge your worldview with actual data. Might as well go ahead and rule out most of the Pacific destinations (other than...

Let's keep some perspective here. Yes, there's some pretty horrific stuff that happens in Mexico. There's also some pretty horrific stuff that happens here and many other places. Don't let the horror stories take the place of real data. There's a name for that particular cognitive bias but I...

No. You do need to explain for your team that your procedure is different that their training. No need to change colors. You need to spend time getting comfortable with reg switching underwater. Good practice anyway, but essential if you are planning on donating your primary. It needs to be...

I live in Houston. Mostly fly United because of the nature of my destinations, but I fly Southwest often to Dallas, Midland, etc. Yes, SWA is a little different, but it's a great airline. Their people are top notch. It's the only airline where I feel like nearly everyone there gives a s@%t...

Lots of good advice in here, but if you're talking about AOW class in recreational gear I might treat this as aspirational rather than something you should immediately go do, unless you just have lots of spare money to drop. For now, no reason to change up your regulator set up, your console or...

There is a good representation of the reaction front in a scrubber canister here: A Look Inside Rebreather Scrubber Canisters, Part 1 and A Look Inside Rebreather Scrubber Canisters, Part 2 If you watch the videos you can get a feel for how having mixed up old and new sorb granules could...