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Product Information This working model shows the principle of wind velocity measurement. Four plastic cups on arms are mounted on a smooth turning axle. The apparatus is sensitive to the slightest breeze, even as low as 2 mph; wind speed can be quantitatively determined by counting the rotations. The hub rides on hard steel jewel bearings, and the base is 9 cm x 9 cm. You may use this model indoors with an electric fan.  Tell a Friend about this item
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