Diode and LED Tester
The polarity markings on LEDs (Light Emitting Diodes) seem to be a common cause of confusion. The polarity may be indicated by a flat section on one side of the body or by one lead being shorter than the other, but different manufacturers are not consistent as to which lead they are marking!
Read More Source:
http://web-ee.com/schematics/electronic_projects/diode_led_tester/
Thank you.
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