This device to measure wind speed  is made from  corrugated cardboard.  A discarded cardboard box  will do the job. Cut the box so it will lay flat on a table.
Mark off  four  3 inch  sections  and a  ½ inch  section for an  over lap to enclose one side of the box tube.
Crease along the corrugations  using a ruler for a straight  edge and  the handle of a spoon .
Fold the cardboard at the creases to make the box tube and glue the ½ inch over lap to the 4th side.

Follow the plan below to complete the wind speed indicator.

To calibrate the anemometer requires two people.  Choose a  still  day with no wind, early morning is best.
Have a friend drive a car at low speed, about 10 MPH .  Place your anemometer into the wind and mark the area
the needle is steady at for 10 MPH.  Increase the car speed to 20 MPH  and mark the area as 20 MPH.
Continue up the speed range and mark off the speeds.  Stay  with in the road rules  and donít exceed the speed limit.

Now with the anemometer calibrated you can  measure the wind speed at ground level as wind speed will be different
at higher altitudes.
When you take a reading, first hold the anemometer level by holding your hand over the opening and move the box tube until you have the needle at rest on zero. Remove your hand and point  the anemometer into the wind.