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If the indicator light is always on or off, remove the optocoupler from the circuit board and insert it into the optocoupler seat of the breadboard to confirm the test results again. Confirm the optocoupler PIN1 (the pin marked with a small dot on the test board also has a corresponding pin 1).
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Coming with one year warranty;.
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Besides, it can also be used to test the continuity of non-conductor. Digital LCD display. hope you could understand. All operations work by two buttons.
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◆If there are no special circumstances, your product will not be delayed in arrival.
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You should receive the item within 2-4 weeks. Therefore, make sure you need it before buying the product.
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