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Video shows you how to cheaply construct a 3-9v polarity checker out of a discarded AA battery. The parts can be found in a disposable cameras.
Handy Polarity Checkerby Erfinden
Simple Polarity Checkerby Salman Naveed
DIY Circuit Component Tester/Checkerby Yase3n
"Jitters Creepers"by iveymarlon8
Arduino Battery Checkerby CrummyGhost
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