The portable machines are great!
I use 2 portable Varon Oxygen machines. NT-01 and the NT-06. I am on oxygen 24/7 and need reliability. You have to understand that the percentage of oxygen goes down the more Liters you use. So, if you must have 90-93% oxygen all the time, the truth is, these may not be for you. The price is excellent and the portables are light and easy to carry!
By Erika

