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Nitrox is generally used in shallower water. They could dive EAN23, I suppose, to stay at or under the generally accepted max of 1.4 ATA O2 partial pressure at 165', but the benefits are negligible vs. plain old air, and operationally things are more complex. The gas has to be mixed, analyzed...

Northeast Scuba Supply Dive Right In Scuba

They are both important. You should not exceed the MOD and you should not ignore the O2 clock.

And *this*, right here, is IMO the best reason not to set your computer to air while diving nitrox. I was about to bring this up but you beat me to it. Good on ya.

I have an Extreme and love it. For me it's far better than my Halo 3D. YMMV.

As long as you can physically disconnect the battery, in or out is not terribly important.

I did not suggest otherwise. If you think I did, please show me where.

While I hesitate to jump in here, as I am very short on time to engage in much discussion for the foreseeable future, there is one point I think important that I have not noticed as I skimmed the posts to get here. My apologies if someone has brought this up already. One of my tech instructors...

Be patient and get a reconditioned one: Used Haskel Boosters and Haskel Air Amplifiers They're expensive enough without going for a new one.

I will have to check. It could be some time before I do, because we are mid-move and I'm not even sure what state they are in. (Edit) Mine are Snappy Hear. Sodium acetate per their website: How It Works

So use an LP98 or something.

I tried those. Under pressure, they get much hotter and last much less time. I keep them around for sea level use.

It's been sort of a while since I was a teenager. In the early 1970's, wet suits were not the wet suits of today. Prefilling the suit prevented the rush of cold water than accompanied entry into the surf. There was never a question of whether water would get into the suit. It was going to...

Not what you're asking, but have you tried a heated vest? If your core is warm your extremities might be OK. That's how it works for me, and I also have Reynaud's Syndrome in my right hand. However, I have a friend (with no Reynauds) who needs heated gloves even when his core is warm, so...

LOL! The OP was specifically asking about diving wet, and what worked for cold water. As it happens, I own three dry suits already, and no wet suits.

As a teenager diving in Maine, I'd dive in the winter using a 3mm hooded vest under a 7mm farmer john with a 7mm hood, 3-finger gloves, and 7mm boots. I'd pre-fill the suit with warm water (we lived on the beach and I always did shore entries). After about 30 minutes my feet would get cold...

I agree completely with those who say air fills won't be any cheaper with your own compressor. They might even cost you more. Even nitrox fills will take a long time to pay you back. But if you dive OC trimix, you can save enough to pay for a really decent system in a few years. IIRC, my...

Not the towers. Just the filters that go in them. Maybe about a hundred bucks? Dunno for your filtration system.

OK, getting uncovered gradually....

Yep.