FTTH Mini VFL-RGT-30mW Visual Fault Locator with 2.5mm Universal Connector,25KM Fiber Optic Cable Tester Meter Equipment for CATV Telecommunications Engineering Maintenance. Constant & stable output power Operates either in CW or Pulsed Pocket size and light weight, easy to use Finding the breakpoint , poor connections, bending or cracking in fiber optic cables. Easy to check fiber faults with visual fault locator, Portable