How to make a Polarity Tester

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Hi Guys, Here a Simple Tester to Cheq the Polarity of Voltage Sources, • So this is a DIY Polarity Tester • Parts • -Ball Point Pen • -Green Red Bulb • -3k Resistor • -2mm Cooper wire • -Straw Pipe Wire • Please SUBSCRIBE Press the BELL Icon • for more Videos • Like,Share Comment • Thanks For Watching • Have a Good Day • ~-~~-~~~-~~-~ • Please watch: How to make Bluetooth speaker box From Cardboard | Using Cassette Tape •    • How to make Bluetooth speaker box   • ~-~~-~~~-~~-~

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