Try this website:
www.worsleyschool.net/science/files/anemometer/anemometer.html
To calibrate a homemade anemometer, you can compare its readings to a known standardized anemometer in the same conditions. Make adjustments to your homemade anemometer based on these comparisons until its readings are consistent with the known device. Regularly repeat this process to ensure accurate measurements.
you count how many times it spin in one minute
You need an anemometer.
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An anemometer detects wind speed.
The term "anemometer" comes from the Greek words "anemos," meaning wind, and "metron," meaning measure. So, an anemometer is a device used to measure wind speed and direction.
An anemometer is used for weather forecasting by meteorologists.
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compass points. Usually a wind vane which swings into line with the direction of the wind.
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