Products fully support the notebook forward and reverse slot interface, using light-emitting diodes to indicate data line, address lines, and other signals for open and short circuits, replacing the traditional method of measuring with a multimeter. Used to repair motherboards with issues such as failure to boot, no display, or memory not being read. This tool is essential for repairing notebook computer motherboards. Install a 3.3V (CR2032) battery into the tester, then insert it into the corresponding DDR5 memory slot on the notebook motherboard. With no power applied to the motherboard, if the test lights illuminate fully and with consistent brightness, the signal lines are normal. If the lights do not turn on or show uneven brightness, it indicates a short circuit fault in that signal line. Use a multimeter to further locate the fault point. Note: Various signals may vary due to differences in motherboard manufacturers, design, and chipset. Please compare with a known good motherboard to accurately identify faults. Appearance may vary slightly due to different production batches, but this does not affect functionality. Color: Green Material: PCB Package Contents: 1 x Laptop Motherboard Memory Tester Card Only the above package content is included; other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.