Hydrogen Gas Detection: Simple & Inexpensive Devices

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Is there a simple method or inexpensive hand-held device available for Hydrogen gas detection?
 
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We have a portable H2 gas monitor available for around $495, model GP-01. Below is a link to more details for this instrument on our web site.

http://www.rkiinstruments.com/pages/01series.htm

Mike
 
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