1、Indicates Open and Short Circuit: Our tester card can indicate open and short circuits for repairing unbooted motherboards, and is used to repair motherboard failures such as no boot, no display, no memory read, etc. It is an essential tool for repairing computer motherboards. 2、Easy to Use: This test board is very easy to use, just follow the normal operation process to operate successfully, even a novice can do easy testing with the right guidance. 3、No External Power Supply Required: This RAM memory slot tester is available without external power supply, which makes your work process easy. 4、LED Light: Our test card comes with LED light which can be used to clearly show the location of the problem for clearer viewing while working. 5、More Efficient: More efficient testing process provides smoother ability to improve the efficiency of workers and make the work process easier.