Feature: 1. Principle: Aiming at the hardware failure points of memory, the DDR4 memory maintenance tester can easily solve various failures of memory hardware, and use the method of light emitting tube indication to replace the traditional manual measurement method with a multimeter. 2. Applicability: The laptop DDR4 tester fully supports laptop DDR4 series memory sticks. 3. Causes Of Failure: The failure of the computer memory stick is mainly due to poor contact of the gold finger due to too much gold finger, wear of the gold finger, PCB breakage, damage to the data line exclusion, open circuit and short circuit of the video memory, poor video memory performance, etc. 4. 105 LED Indicators: The product uses 105 LED indicators to test all data lines of the memory, and the normal brightness is regarded as normal. When a hardware fault occurs in the loop of these data lines, bright or no light is abnormal. 5. Small Portable: Laptop DDR4 memory stick circuit test tool troubleshooting card is small and portable, easy to carry. Specification: Item Type: DDR4 Memory Test Card Material: PCB Battery Type: CR2032 Button Battery (Battery Not Included) Applicable: Laptop DDR4 Memory Stick. Package List: 1 x DDR4 Memory Test Card