This is a new product for mobile phone Logic board repair.It can help the technician accurately and quickly judge the current interruption of the main board.If you are not a professional motherboard repairer, be careful when buying this product. You need to do your research and learn this product.This product belongs to the auxiliary tool and is intended for professional technician use only.Note: The machine must not be connected to the motherboard for more than 2 minutes, because the failure of the motherboard of the mobile phone can not exceed 2 minutes. The heat will be generated during use. If the failure exceeds 2 minutes, the heat will exceed the range of the motherboard and the machine. Please note when using.