Fiber optic visual fault locator adopt 650nm laser diode  as a light emitting device, the output power can be up to 10mw. It's applied to single-mode or multi-mode fiber measurements.HY-16 uses 3pcs of 1.5v AA battery for power supply, making up the deficiency which power supply time for traditional 2pcs battery is short. It uses FC adapters as an output interface, in the meantime, you can use SC / ST adapters without configuring the conversion interface , it can optionally connect all frequently-used joint.HY-16 is an ideal tool to test various types of optic fiber patch cords, , ribbon, bundle fiber optic pigtail and maintain a variety of fiber optic lines for you.