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I took my Arrow up to 10,500 today to check out my fingertip O2 
		
	
		
		
		
		
		
	
		 
		
	
	
	measuring device. I can maintain 90-93% saturation with deep breathing and no supplemental O2. Anybody know what the minimum safe level is for daytime? I guess it might be cumulative, i.e. the longer you go at 92% the less safe it is? Dropped down to about 88% when I got distracted with some cockpit chores and started normal sea level breathing.  | 
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