Dopers, I need your help! At work, we are looking for a device that will measure the concentration of oxygen coming out of an oxygen concentrator. My boss used to have such a beast, but cannot remember exactly what it was called. Also, it is nothing fancy - that is all it does. Can anyone help?
It’s called an ‘Oxygen Analyzer’.
Here
According to his web site, my buddy Ron has a couple of used analyzers available – you’d probably have to buy new cells and batteries. Ron should be able to help you source cells, and acquaint you with operation of the unit.
He’s at Best Use.
Thank you both very much! I knew I could count on you guys 
You’re welcome.