1、Test open and short circuit of intel 1155 BGA CPU socket and Northbridge connection bus signal 2、Using the method of LED indication instead of the traditional multimeter manual test method 3、Prevent damage to the CPU during repair or commissioning 4、Is a must-have tool for repairing and debugging computer motherboards 5、It is convenient and intuitive to replace the traditional multimeter Features: 1. Test open and short circuit of intel 1155 BGA  CPU socket and Northbridge connection bus signal. 2. Using the method of LED indication instead of the traditional multimeter manual test method. 3. Prevent damage to the CPU during repair or commissioning. 4. Is a must-have tool for repairing and debugging computer motherboards. 5. It is convenient and intuitive to replace the traditional multimeter. Specification: Material: PCB Suitable chipset: for intel 1155 interface motherboard Scope: desktop Size: 3.7 * 3.7 * 2cm / 1.5 * 1.5 * 0.8in Weight: approx. 21g Package list: 1 * Test Card Instructions for use: 1. Put the tester in the CPU socket and press the CPU iron cover (note that it cannot be powered at this time). 2. At this point, the DMI and FDI signal indicators will be fully illuminated. If the light is not on, it indicates that there is an open circuit short circuit fault, the CPU pressure bar can be shaken, and the fault point can be further determined by the multimeter. Note: 1. The motherboard cannot be powered when the motherboard is tested. 2. The user needs to purchase the (CR2032, 3.2V) battery into the tester slot. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.