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by TSI Incorporated
Last updated Mar 29, 2026 · 2 revisions
Compact rotating vane anemometer with 4-inch vane head for accurate air velocity and volumetric flow measurement at grilles and diffusers.

The TSI Alnor RVA501 Rotating Vane Anemometer features a 4-inch vane head that averages velocity readings across its measurement area, making it ideal for measuring airflow at supply and return grilles. It measures velocity from 50 to 6000 FPM with data hold, min/max capture, and optional duct size input for volumetric flow calculations. The lightweight, ergonomic design is suited for residential and light commercial HVAC work.
How this product is delivered and what's included out of the box.
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