I updated this drawing with a skematics of how to connect it
to a hand held VOM/Counter combination.

Four or more of these can be used with a $5 selector switch.
One can select them one at a time to check the air flow
distribution through the rad.

I would like to clarrify why I went through all this trouble
to modify a fan to act as a flow sensor. Some fans will work
without modification but they take excessive airflow to start
turning because of the magnetic attraction between the
pole pieces and the ring magnet. By eliminating the pole
pieces I eliminating the drag on the fan. 

Paul Lamar
 
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