The Extech 407113 Heavy Duty CFM Metal Vane Anemometer is a robust instrument designed for demanding industrial environments. It accurately measures airflow in CFM, air velocity, and temperature simultaneously, providing valuable data for HVAC system diagnostics, ventilation assessments, and process monitoring. The anemometer features a super large LCD display, multiple airflow measurement modes (instantaneous, average), and data hold functionality. It's supplied with a protective holster, hard carrying case, and a metal vane sensor with a 3.9ft cable, ensuring reliable performance and portability. Optional accessories include a NIST traceable calibration and AC adapters for flexible power options.