Features: Brand new and high quality Used to repair is not switches on, does not display, does not read failure such as motherboard, memory is an essential instrument for repair computer motherboard. Equipped with battery (CR2032, 3V) insert battery to insert the test card and insert into the corresponding type of motherboard, and insert the motherboard, presses the switches button, test card can assess motherboard memory part of open circuit. If a lamps is not clear, Could memory and holder or with short circuit, must check the signal and power supply circuit. Ensure the stability of your computer system with our DDR4 Memory Testing Card, designed to provide accurate and reliable testing result. Made from high-quality PCB material, this testing card is durable and built-to-last. Specifications: Material:PCB Model:DDR4 Package Includes: 1x Test Card note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.