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Originally Posted by trivialpersuit

Hello,

I am on an oxygen concentrator too and was wondering the same thing. I don't know if I understand it right. So say the liters my doctor has me on is 2.5L, so the ball should have the line (that is past 2 and before the 3, making it 2.5) through the middle of it so it will be 2.5 liters. Do I understand that right?

Thanks

The middle of the ball is used to read even numbers (on the machines
I am familiar with).

Here is a graphic representation of 5.5 LPM: