The KI 6354 visual fault locator is a small, high quality and very low skill fiber cable tester. It has only one button, and an operating range of a few km.
Visible light is injected into the fiber under test, and can be seen from a fiber end, or through most 3 mm cable types at a break or loss point.
Unusually, this pen meets Class 1 safety standards (IEC IEC60825 2011) for total emitted power when no fiber is connected, so does not need any special safety eye safety precautions under any condition.
Optical Communications Test Applications: