PC Diagnostic 2-Digit Card.A nice quick handy helper tool kit for started in troubleshooting desktop PC, Laptop and Server computers. The motherboard diagnostic card is also called a POST card (Power On Self Test) or a PC analyzer. It is a code that displays the motherboard BIOS self-test procedure. When combined with the meaning of the POST code in the manual, you can quickly know where the computer is malfunctioning. Insert the diagnostic card into the PCI or ISA slot of the computer motherboard. According to the digital code displayed on the diagnostic card after turning on the power. and hex the code of your booting computer.Hexadecimal character display.4 LED indicator.Detailed & precise LED function table and code Indication table, convenient consulting Colour:green Material:plastic Package Contents: 1 * PCI Analyzer Card Only the above package content, other products are not included. Note: Light 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.