DIY polarity tester positive negative finder

A.O.A. in this new video, I show you how to make a DIY polarity tester positive negative finder. you can easily make a polarity tester at home and find positive negative of anything.
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Materials Required:
1. Injection syringe
2. copper wire
3. Resistor
4. Red & Green LED
5. Alligator Clip
6. Wires
Music credit: www.bensound.com
#ARSLANTECH #DIYpolaritytester #positivenegativefinder

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