Bests & Worsts Reviews from Amazon

I was a 22 year ICU RN and this is the exact "voldyne" volumetric we used in the hospital. Same company. Looks exactly the same. I am using it for breathing exercises. Just remember one thing: you do not blow into it for any reason. You blow all air out of your lungs then suck in continuously and steadily, trying to keep the ball at the highest level you can maintain. It WILL make you cough. It measures tidal volume and reserve capacity but it's main use is as a lung "exerciser". But, never take anyone's opinions/instructions from on the internet unless you are positive of their veracity and qualifications. Ask your PCP/PCM/Family MD.