Feature: 1. Use four-digit fault code display; 2. The code value of "Start Code" is a specific "0000" or "FFFF", which is clear at a glance. However, the code value of the "start code" of the traditional two-code diagnostic card is uncertain and cannot be accurately distinguished by the human eye; 3. to test the speed of motherboard PCI and ISA bus; 4. Can test the fault of the diagnostic card itself; 5. It is fully compatible with high, medium and low-end motherboards (for motherboards of low, medium, high and even server CPU platforms from FOR , for AMD, VIA and other manufacturers), the fault code is more accurate and reliable, and it does not crash; There is a function of repeatedly checking the code, and the code will never flash by again. You press the switch once to display a code to pause; The use of SMD components does not hurt hands; It has the function of beeping to report failure; This card can be plugged into ISA or PCI; After inserting the wrong slot or reversely, the power will not burn any parts; Can display the crash of repeated automatic reset under the black screen; Power on the board without plugging in the CPU and other empty boards to diagnose important signal conditions in the board; The computer motherboard fault diagnosis card displays the cause of the fault through signal lights and four-digit digital tubes, and has a buzzer. The operation of the tested motherboard can be seen at a glance. Due to different batches, the appearance, color, and printed words of the product may be different, which does not affect the use. Material: PCB colour: green Package Contents: 1 x Diagnostic Post 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.