3. LED indicator light: The LED indicator light is used to test all data lines of the memory. Normal brightness is considered normal. When there is a hardware failure in the loop of these data lines, it is abnormal whether it is on or off. 4. Purpose: If the test indicator light flashes, it means the gold needle is in poor contact. If no indicator light is on, the hardware has an open circuit failure. Check the wear of the gold needle to damage and whether the PCB is disconnected. 2. Computer memory failure: Computer memory failure is mainly due to poor contact of the gold pins, wear of the gold pins, damage to the PCB, damage to the data cable, open circuit, short circuit of the video memory, poor memory, etc. Features: 1. Applicable scenarios: Desktop computer DDR4 memory test card is suitable for desktop computer DDR4 memory. 5. Easy to use: Insert the CR2032 battery into the battery holder of the test card, or connect the Type C cable, and then insert the memory card for testing., Weight: 0.19180216794 Pounds, Manufacturer: Ehwisbe