Easily track your blood oxygen saturation from home, and notify your physician if it drops below a certain level. In addition to CoVid-19, other conditions affecting the blood oxygen levels include Anemia, Asthma, COPD, Heart failure, Lung cancer and pneumonia.
"Most healthy people will get an oxygen reading around 95 to 98 percent. Some people with existing health conditions may have a lower normal reading. You should check in with your doctor if the number falls to around 93 or 92 or lower.
"The device will also show your heart rate. A normal resting heart rate for adults ranges from about 60 to 100 beats per minute, although athletes with a higher cardiovascular fitness will have a lower pulse." (New York Times)