The little skin sensor works by looking at the "redness" of the tissues. This makes the assumption that "red" equates with "O2-saturated hemoglobin". Since the N2 isn't reacting with anything in the body, this would be difficult to sense. I think the only way to do this would be some invasive procedure. On the other hand, medical engineers are pretty durn clever - they may manage it some day! -- Kevin (ex-Paramedic) -- ------------------------ Each new day's but a chance to regret the things I wish I had done... Here's hoping I have fewer regrets as the years roll by!
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