Portable Oxygen System

I got a good eBay deal on an Aerox portable oxygen system for the airplane. The RV series of airplanes can easily climb to and cruise well above 10,000 feet which gets you away from most small airplane traffic plus you can get above weather, turbulence, birds and the heat all while getting better gas mileage. To fly that high in an unpressurized airplane legally requires oxygen anytime you're between 12,500 feet and 14,000 feet for more than 30 minutes and all the time you're above 14,000 feet. Those are the minimums but most use it more often to arrive refreshed after a long cross country at high altitude and especially at night as night vision is affected early with just a little oxygen debt. Later, I'll get a small battery operated pulse oximeter to monitor actual oxygen content. They're the kind that clip onto your finger like you see in the hospital.