Lennox was selling these for $45.95.
Soon the only tool we'll need will be a smart phone!
http://www.airflowbalancing.com/abm.html
Looks cool.where would you find the most application though
I guess not a bad deal for that price.
I use the CFM airflow meter in new construction to balance the system. It's much quicker to use than the more expensive instruments. It seems to be quiet accurate as well.
I attached a picture of some other smart phone instruments.
i used it and it works awesome!