do research , page-48

Agreed. The effort is minor and the reward is significant. But generally the spirometer is still only used in a medical environment. It isn't really being marketed for home consumer at this stage. And even in the medical arena, spirometry isn't really used on a regular basis. It's more used for initial diagnosis and maybe on followup checkups to see improvement and adjust treatment. It isn't really used for regular monitoring per se'.

What might be an interesting avenue for ISN to persue, is to license/sell the technology to existing spirometer manufacturers as a bolt on addition. So device can do both?

Or ISN could go down that path themselves and build a cheap spirometer that incorporates Wheezometer technology.