H2Andy:i have to qualify my answer, since it's not an option
i don't dive Nitrox unless myself or my buddy has tested it. i know
i'm supposed to test it myself, but sometimes that's impossible and
i do trust my buddy to have tested it correctly when they arrive
at the dive site with the tanks
i think what i need to do is buy a tester and just carry it in
my car... of course... that costs money....
Andy,
Just remember this. When your buddy makes a serious error or tests one and grabs another, he will be very sorry and feel very remorseful.
You will not........feel......anything........ever again.