Quadcopter Motor Damaged? How to find out. With a drill.

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There aren't very many easy ways to tell whether a quadcopter motor is damaged. Lots of times, they look fine, but drop out of the air. Is it the motor? Is it the ESC? Here's a cool trick for testing a quadcopter motor using a drill and a multimeter.
The tachometer that I use is:
The multimeter that I use is:
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