I have worked at all levels of healthcare for 30 years. Why do we need a meter to tell us the patient is sick. That's why they present in the first place. This unit does not perform differential diagnosis nor does it (if it reads negative) stop any good practioner from ordering more tests to diagnose what is behind a chief complaint based solely on the results of a handheld meter measuring oxidents. Lawsuit !!! So unless i am really missing something here there is no market for a device like this without the ability to perform differential diagnosis. Now if it can to that ....well the sky would be the limit.