We have the little clip on O2 sensors, They tell us (along with the huffing and puffing) when the blood O2 gets low. If you are going to use it to prevent the virus I suggest using it for 3-4 hours minimum after any exposure. Get some long tubing 20 to 50 ft. so you do not have to keep getting away from it for indoor chores.THanks for the info. From what I have been able to find a pulse oximeter would help determine the amount of O2 in someones blood.
This is why I mentioned the 2 L/M max. The body's sensing circuitry changes over when too much O2 is present for too long a time. It is non recoverable. Learned this in EMT class. Using O2 is simple if a few rules are adhered to.This is like asking "what dose of penicillin do I use?" So much depends on your history and medical conditions. You cannot buy or rent (from normal sources) an oxygen concentrator without a prescription. I know that most lay-people may not believe this, but you can get too much oxygen.