Airflow Cone and Funnel Adapter Kit for AN300, AN310, AN320
Accessory Kit for Airflow Measurements for Common Large Size Ducts

Cone/Funnel Adapters is a meter that has a cone and square preset. With this optional kit, it would allow HVAC technicians to be freed from the hassle of calculating dimensions and allow for quick and easy air flow measurments for these common duct sizes(8.26"/210mm round and 13.6/346mm square).

The device, Extech AN300-C is compatible with AN300, AN310 and AN320.
For quick and easy air flow measurement for common large size duct sizes of (8.26"/210mm round and 13.6/346mm square), you need Extech AN300-C Airflow Cone and Funnel Adapter.