This is exactly why Bill Daniels and I recommend pilots carry and use an

oximeter at all times, even while in the club house. This is especially=20
important in high elevation areas, like Colorado.=20

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Might I suggest that you read the post on URASB regarding oxymeters and
caution regardingt their use, by Peter Saundby (the BGA medical advisor,
and retired wing commander from the RAF medical branch with significant
knowledge in regard to aeromedicine).

Rgds,

Derrick Steed