Soundness using FGA

Best ask one of the BG guys on here, they spend half their life with their probe up some old dear's flue. And the other half using their FGA!!
 
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i got a free FGA off someone, so im using that now :rolleyes:

Lovely. Has it been properly and professionally calibrated within the last 12 months? Can you prove this with a certificate? If not then all tests will be deemed invalid, and could produce unsafe results.
 
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