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30mW 30KM Red Light Pen VFL Tester Visual Fault Locator LC/FC/SC/ST Interface FC Male to LC Female Adapter, Fiber Tester Detector Fiber Network Cable Tester. VFL Red Light Pen for Network Cable Test, Fiber Optic Source Tester Detector Meter for FC,SC,ST,LC. Fault Locator Kit 30mW 30KM with 2.5mm Universal Connector FC Male to LC Female Adapter. This visual fault locator can accurately detect and locate fiber breaks, as well as problems such as poor connections, fiber bends or cracks. The detector will emit 650nm strong light, and the break or fault in the optical fiber will refract the light to determine the location of the fault. Widely Used: The 2.5 mm universal connector of the detector is designed for ST, SC, and FC compatibility, and can interfere in different circular and square optical cables. Test single-mode and multi-mode cables. This visual fault locator has a strong red battery output and can travel 20-30 kilometers. The efficient power supply circuit can provide stable power.