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The ABM100 Airflow Balancing Meter is an anemometer that fits in your pocket.
You can download the free app and plug in your ABM100 meter. Enter the grille or duct dimensions and then hold it up to a grille or duct opening, your phone does the rest. By using a series of algorithms the ABM automatically calculates the airflow volume. The ABM100 also provides the ability to automatically adjust the free space calculation if a grille is present. It has the ability to add comments with each reading if desired.