| Ok I found a possible solution to cheap rpm reading.
http://www.dealextreme.com/details.dx/sku.2682
I haven't tested it, nor do I endorse it. But hey for 5 bucks it has rpm readings, so no conversion from a MPH reading needed?
I could see this as a cheap solution for windmills, or even building a home brewed anemometer. Ordered one to play with..
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