Since I travel a lot for my diving destinations, I am usually not familiar with the dive shop where I get fills/tanks. Although, I like to get recommendations from others that have gone before me, sometimes it is not possible. So, to cover myself, I made up this wallet card to keep with me. I can use it to ask the shop if we can compare the ANDI standards that I have to their gas analysis from the compressor. Out of this request to the dive shop, it should become clear what you are getting in your tanks one way or another.
I thought some of my fellow divers might see this as handy so I'm posting it. If you print the 2 pages in duplex, you will get the
safe fill rate for oxygen on the back of the wallet card. Print it out on Avery 8371 or it's equivelant business card template. Enjoy!