Voldyne Volumetric Exerciser 4000 mL, 1 Count

After having major surgery and exercising I still needed something to help me out a bit. I was skeptical about how cheap this was but after using it for a few weeks, I am still very happy with it and the quality and usefulness of it. Instructions are good, and I appreciated the chart showing averages for age groups. The spirometer itself seems to be your standard sort of thing, and there's nothing much that can go wrong with it nor have I had any issues. Like anything plastic it is best not to drop it. Works well and helps me monitor my condition as well as work on impriving lung function.

Needed this for breathing exercises, it is very good for people who need this for their lungs when you have had problems with breathing.