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Comment: Before you dive, you should push the piston in just past the hole. No need to close it.
Comment: Depends very much on your location. I buy them from here http://www.biltema.fi/fi/Tavar…
Comment: Pressure p = volume at surface / compressed volume.Depth in meters = (p-1)*10For 20ml …
Comment: You're totally right and I feel bad about it. Just removed the improperly used symbol. …
Comment: The technique you described only works if you have an excess of air (which you have whe…