This is a good thing to have in case you get an infection. It is used to check your oxygen saturation.
Hemoglobin is the molecule in your red blood cells that carries oxygen. A pulse oximeter checks the percentage of hemoglobin that is saturated with oxygen. The higher the number, the better.
This is one of the things that you can use to make sure your lungs are still working okay if you get infected with COVID. (You might feel crappy, but at least you know your lungs are still working well. It is reassuring to have.)
If you drop below a certain number, you would know that you need to go to the hospital to get help with getting enough oxygen into your body.
A good thermometer and a pulse ox are two things to have in your house right now!
It’s pretty cheap, like in the $25-$30 range. I encourage everyone to get one!