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We can use a regular pointer multimeter to judge the quality of light-emitting diodes and distinguish electrodes, just like detecting ordinary diodes.

. Set the multimeter to "R × 10k "gear, measure the forward and reverse resistance of the LED. Generally, when measuring forward resistance, the watch needle should be deflected by more than half, and there is a bright spot in the LED

Note: Since the positive pole of the battery in the multimeter is connected to a black lead and the negative pole is connected to a red lead, the pin connected to the black lead is the positive pole of the LED, and the pin connected to the red lead is the negative pole.

. After swapping the two probes, measure their reverse resistance. The probe should be almost stationary (the resistance value should be infinite), and there should be no bright spots in the LED. In the detection, if the difference in forward and reverse resistance is found to be very small, this LED is likely to emit extremely weak or no light. If both measurements show a short circuit (with the needle deflected to the end) or an open circuit (with the needle not moving), it indicates that the tube is broken