Found nice O2 flow meter for disposable tanks

Ingredients
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http://www.amazon.com/gp/product/B003IGNKG4

Been using this for a few batches now and it works good.  I hooked it up online very easy. Most literature recommends 1 liter per minute for 1 minute for most 5 gLlon batches with a .5 micron stone.  This pieces measures from 1.5 l/m to 4.5 l/m.  I have a 2 micron stone and have been using 2 l/m witch seems ok since my stone generates less surface area. Really what I was interested in was consistency and a way to judge aeration in a conical since I struggle to see the bubbles throughout the top opening.

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Looks cool ,any more updates

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works great!  I have used it on a few batches now.  I don’t know for sure that the l/m is accurate but it is consistent and repeatable.  The only thing I would warn about is if any water gets into the tubing it can get into the flow meter which probably isn’t good.