At 08:09 12 October 2019, wrote:
Of note:

I was going a good job with my cannula. I kept an eye on my pulse
ox,
things were going well.

Started eating some trail mix for lunch.... oh yeah, mouth breathing.
Pulse Ox was headed south in a hurry.

Just something to think about. I had to be extra vigilant to not stuff
my
face all at once, and when taking time to drink and eat... consciously
make
sure to take good hits off the O2 with my nose.

JP


Bought an 'FDA Approved' Finger Pulse Oximeter Blood Oxygen
Saturation SPO2 Heart Rate O2 Patient Monitor from fleabay to try out
($25-ish).

Although it was a bit clunky sitting on the end of my finger, it appeared
to work reliably well on the ground (slight overcast?) or airborne under
cloud.

At altitude it repeatedly failed in very bright sunlight. (Measures light
absorption of the blood in your finger)
Whenever I uncovered my hand in bright sunlight to read the display it
immediately lost the plot. Wonderful!

As an experiment I covered the device and part of my finger in the foil
from a snack bar leaving the display (mostly) uncovered, it worked
much better but was even more inconvenient.

Don't buy cheap??! (YMMV)

MR