Oxygen Level Check-Lung Check

Only giving one star as there's no option for none. Every time you click you get adverts. Fine to get some but this is crazy. App itself seems like it's done on the cheap. Sorry, but it is what it is.

Dumbest app! You can hold your breath and check without this app with the help of a digital watch on your phone... Just hold your breath for: 20 secs, your lungs are good. 30 secs, you're talking good care of your lungs. 40 secs, your lungs are in excellent condition. 50 secs, you must be an athlete. 60 secs, are you a scuba diver!

Not a o2 measuring app. It says if you can hold your breath for 20 seconds, you may have good oxygen levels. To find this out, there is 4 ads to close first.