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Plastic bags are good for short term storage, but they are slightly porous. Over time they will leak and ambient moisture will find its way in. If you want to actually store something vacuum sealed for any length of time, mylar bags are necessary. Alternatively, you can place it into a hard...

The common oxygen sensors are about +/-1% accuracy at full scale just to begin with... how much else you want to add in with your circuits compounds that. FWIW, I'm a fan of eliminating as much as possible (hence the offset elimination and high precision op amp in the circuit I shared) but the...

Just amplifying the O2 cell's level is not the _right_ way to read it. It works somewhat, and a lot of the el Cheapo analyzers use that method, but it's not the correct loading for the cell to work as spec'd. There's a more elegant way to do it, and it ensures your reading is a lot more...

Google "DiveSoft" and you will find what you're looking for. It's really about the same price point as the thermal sensor ones (or close enough that no one should care.) Just be careful if you use it and make sure you do not get water into the lines at all... let's just say that one comes from...

You don't "need" an analyzer for helium unless you're trying to continuously blend through a compressor. Buying the helium from a traceable source and good hygiene plus junior-high chemistry and math skills will get you everything you need. (Breathing the sample on land, plus a good oxygen...

Usually about five years, but it depends on the sensor. I've gotten six or seven out of them, but officially the one I have is five. Helium can and will diffuse through the glass of sensor (tiny little molecules...) which causes it to no longer be a good reference sample on those thermal...

It's all there in the specs; the latches are complete (two pieces), and I just bend the up/outward part of the latch down so it's against the canister material. Screws are #6, per spec. The type of screw depends on the material you're putting it into... I just use a 300-series stainless steel...

These are the ones I use: McMaster-Carr

FWIW - it's a PITA to find them. I ended up buying out the entire stock, sight unseen, of a dive shop going out of business, just to keep kits around for the Beuchats I have. The old ones were some of the best regulators out there, but the company support in the US was never good... and the...

M16 x 1.0. Not too hard to find from metalworking suppliers. The more common M16 threads are generally either 2.0 or 1.5 (coarse and fine) so you may need to poke around a bit. I think I got my tap from Enco or MSC Direct... <edit>Enco has them Model #891-4979 for just under $20. If I was...

The actual answer is "it depends," not "throw everything away." Mixing everything and trying to dry it in the sun, however, is right up there with the stupidest ideas I've ever heard. Not knowing or caring who they are, I would personally stay away from those people before they injure someone...

I wish I had the spec handy, but it's at home, and I'm on a business trip this week. FWIW, I ended up having to get the last one I replaced at Grainger (there's one by me, but you can order online), and not an auto parts store, because it was something fairly unusual in size/profile/etc. I...

FWIW, I picked up some of this material and used it to heat a motorcycle vest; I had a zip out liner on one of my riding jackets, and I sewed a zig zag of the material from the left side, just inside the zipper, to the right side (around the back). I then ran the 12V leads up the left and right...

Last time I refilled my stock, Lighthouse for the Blind in St. Louis: LHBWEB HOME PAGE was still the best and cheapest supplier...

Awesome... I've had the neck seal on since they came out, and I put a set of wrist seals on for Florida (caves... diving at home I use dry gloves.) The wrist seals actually keep my wrists dry, which the latex never did. The neck seal does not give me a hangman's rash even after a solid week of...

No lube is proper on the first stage connection o-ring. It should be dry if you're doing things properly. It doesn't move and is for sealing. Lube increases the risk of extrusion. Christolube or Tribolube for the two o-rings on the spool. A small purchase of a tube will last you a lifetime...

Good suit, made well. I have one that I've been using for ten years. It's my back up suit (or for guests that are around my size when they come from out of town) but it functions well. I really like the boots on there as stock - they're Wellington style boots, so you need a fairly big...

Loc Line has a set of base links that are male plugs threaded in various standard sizes. Pick the section that's threaded for the hole in your arm, and/or tap the arm for whatever you have. That's how the lower end is done. For the light end (the top), the easiest thing I've done is to find a...

Just watch your head temps on them and you'll be fine. They're easy to work on and inexpensive to maintain. A couple of AL80s in a row won't kill it. I use mine all the time on a set of doubles, plus a couple of stage bottles before I give it a rest... usually while prepping or cleaning gear...

I have an old Coltri MCH-6 (3.5 cfm) which came as gas. I ran it that way and then swapped it out for electric. Compressors take quite a bit of maintenance to run properly, and the additional work to keep the gas engine going properly (oil changes, air filter, new spark plugs) plus the need to...