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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{2896cb84b3c339cc8ebaba6496b573bfde48516f782530d73f4530946dd3874e} of full scale to 100 FPM and ?10{2896cb84b3c339cc8ebaba6496b573bfde48516f782530d73f4530946dd3874e} 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.