Hi, a spirometer is a device one puts on the finger to determine oxygen content of blood and pulse rate. It is small and you can order it on Amazon. The top number is the oxygen content of your blood which should be above 90. In healthy people it's between 90 and 95, If your O2 (oxygen) levels go down your pulse rate goes up as your heart is working harder to get blood to your organs.
Breathing tests done on a computer are pulmonary function tests. Each one of the scores i.e. FEV1 measures your ABILITY to breath. in this case the air you can blow out. Just look up spirometry tests or even each score and you will find out how your score looks compared to others. These scores and the meanings are easy to look up. Hope that helps, we all have to learn this. Take good care, Laddieday