The MODEL 480 Vaneometer™ Swing Vane Anemometer is a durable, economically priced instrument specifically designed to simplify the measurement of low air velocities. It is accurate to ±5% of full scale to 100 FPM and ±10% from 100 FPM to the top of scale. It has a spirit level to ensure accurate readings and the large scales are easy to read and visible from both sides.