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DIY Polarity Tester positive negative finder

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DIY Polarity Tester / positive negative finder Materials Required: 1. Old Bolt point Pen Transparent 2. 2mm copper wire 3. 3K Ohms resistor 4. Red & Green LED 5. Alligator Clip 6. Wires Subscribe LahisTech: Subscribe for more future creative project videos. Thank you.

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