OP stated that tech didn't measure airflow so it was ASSUMED he didn't have the tools. We all know what assume is so lay off the tech please. The fact is most tech's don't measure it if they don't feel it is necessary. Nothing to do with what equipment they have in their arsenal.
Apparently I missed the word "apparently" in the Op's statement. Maybe I should have worded it differently. Not trying to pick on tech, but just trying to advise he may need someone who is better qualified.