Features: Products fully support the notebook/Desktop slot interface, is the use of light-emitting diodes and light to indicate the data line address lines and other signals open and short circuit, instead of the traditional of measuring with a universal meter used to repair not boot, Do not show, do not read the memory and other failure of the motherboard, is to repair the computer notebook/Desktop motherboard essential tools. Specifications: In the tester installed 3.3V (without CR2032) battery, respectively, into the corresponding notebook motherboard every DDR4/5 memory slot, the motherboard without power, the test light is full and brightness consistent, indicating that the signal line is normal, if the light does not light or bright , Indicating that this signal has a short circuit fault, with a multimeter to further determine the point of failure. Note: The signals of the tester, due to the manufacturers of the motherboard design and chipset of the different parts of the signal may show different, please compare to the same motherboard to determine the fault. FOR A-DDR4 Laptop Material: PC+metal colour: As shown Package Contents: 1 x test card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.