Extech AN300-C Airflow Cone and Funnel Adapters fit with Extech AN300 series anemometers and feature 8.26" (210mm) round and 13.6" (346mm) square presets which allow HVAC technicians to be freed from the hassle of calculating dimensions and thus provide quick and easy measurements for these common duct sizes.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
