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this  inscrutable  show how to make an wind speed meter. it's really easy so its won't need more than 5 minutes to make it .

Step 1: materials


for this inscrutable you will need :
-computer fan
-230v cable (without grounding)
-multimeter
This is actually a really good idea! I might need to try this...
add a trimmer in series with the fan to limit the voltage for calliberation

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