Spirometer is one of the very useful medical devices. It is also one of the most common diagnostic tool. It will monitor airway obstruction and breath exhalation. The portable spirometer is usually equipped with PC-based functionality so that you can easily print and analyze the result. There are many manufacturers of spirometer. You can always look for online information about this product right so that you will be able to find the right spirometer for your medical practice.
I am sure that many medical practices prefer certain brands of spirometer but I think that as long as this tool functions well, it will not matter who is its manufacturer.