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What was the expected cost and when will Vance upgrade the hackers guide to
include a helium version......  :-)

Art.


	-----Original Message-----
	From:	Deep1dave@ao*.co* [SMTP:Deep1dave@ao*.co*]
	Sent:	Monday, January 24, 2000 5:11 PM
	To:	MMikeodin@ao*.co*; techdiver@aquanaut.com
	Subject:	Re: Helium sensor

	Concerning the Helium sensor that was on display at DEMA,

	I saw it on display in the Dive-Rite booth.  It was a Helium sensor
for 
	testing helium concentration in tanks.  They claimed that it used a 
	differential calculation on the thermal conductivity of air vs. the
helium 
	mixture.  They claimed an accuracy of +/- 1%.  Sounds interesting.
Any 
	thoughts??

	David
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