Posted by Steve on March 22, 2001 at 00:16:17:
In Reply to: Re: tri mix cert. posted by Jim Hoffmann on March 21, 2001 at 08:31:40:
Sounds interesting but Helium isn't cheap at least in the quantity that I have purchased for filling ballons. Unless you can buy helium in large volume cheaper, I would estimate that an AL80 would cost $25-$40 per bottle, because of the extra handling time to anaylze the current mix and then compute the helium/oxygen to add before topping with air.
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