Portable oxygen concentrators are sophisticated electronic machines and medical equipment, which filter the air around you into highly concentrated oxygen that you can breathe. Because of this reason, most oxygen concentrators in general aren't cheap. Portable oxygen concentrators cost even more, because they need to be able to house and run off of a battery while going mobile.
There are certain models that are less expensive than others – not because they are inferior or because they don't have the best features or the high settings. Here are three of the best of the least expensive portable oxygen concentrator models on the market today.