Logic probe use different colors indicating lights to show the electrical level of the instrument.
It is a simple tools to test digital circuits PCB. It can easily diagnose the faults chip in digital circuit PCB. There are three signal indicating lights of the logical probe, red light indicate a high level, green light indicate the low level, the orange light means the pulse signals.
When test, the red alligator clip to the positive terminal of the test circuit, the black folder negative .
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