1. AGP, PCI-E tester is mainly used to test the open circuit and short circuit of the data bus connecting the computer card chip CPU and the computer motherboard PCI to the ground 2. When repairing the computer's card failures such as non-display, blurry or unstable display, it is not necessary to use a multimeter to measure the PCI bus interface between the card finger and the motherboard one by one. This card tester can quickly detect the open circuit and the CPU Short-circuit failure, with 100% accuracy, is a standing tool for repairing cards. 3. When repairing the computer card, if the display card does not display, the screen is blurred, etc., first check the appearance for obvious burnt marks, whether the PCB is obviously disconnected, and whether the voltage of each group is normal. If it is normal, use a tester to further measure the CPU Whether the data cable connected to the motherboard PCI interface is normal. 4. a 12V power supply to the tester, insert the fault card into the corresponding slot, press the Press switch in the upper right , the corresponding indicator on the tester should be all on, if it is not on or flashing, the brightness will change significantly , Or caused by the open circuit or short circuit of the main chip CPU, use the universal meter to further determine the fault Colour:black Material:PCB+metal+plastic Package Contents: 1 * AGP PCI-E diagnostic card(The color and style of the graphics card slot are random, no designation is accepted) Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.