Rotating Vane Thermo-Anemometer Newly developed reversible head for measuring air velocity at exhaust and inlet grilles with one instrument Sweep mode measures average air velocity or air volume over an area or period of time Displays measurements in metric or imperial units Ergonomically designed for high performance, unrivalled accuracy and ease of use Air Velocity Range: 0.25 to 30 m/s (50 to 6000 fpm) Optional AirCones quickly convert the model HK666 into an air volume flow balancing tool Aerodynamic design for minimal resistance Two sizes suit most supply and extract grilles Self sealing for leak tight readings Constructed of hard wearing ABS Volume flow curves in m3/sec and cfm Air Volume Range: 0 to 0.1 m3/s (0 to 210 cfm) Specifications Data Logging / Not Data Logging: Not Data Logging