Review on YGGYM Optical Function Universal Interface by Victor Olsen

Reset? How do you test fiber optics? Do I need to hold the end of the cable, it won't connect, and then hold the other end of the cable and the device? I can't use it at long distances without a separate light source. The guide tells you what the buttons do, but now how to check it. Should there be adapters for different fiber optic connectors?