1037486 Rva801 is a lightweight, robust and simple to use rotating vane Anemometer that provides accurate and reliable readings every time. Ideal for HVAC commissioning at Grilles, ducts and diffusers. The Rva801 displays readings in metric or Imperial units. What’s included: hard carrying case, batteries, nist-traceable calibration report supplied by manufacturer, and user manual. Calculates volumetric flow rate compatible with air cone flow hoods no density correction factors required automatic averaging of air velocity.