5 Pack SainSonic TL532 10mw Visual Fault Locator Fiber Optic Cable Tester Meter for CATV Telecommunications Engineering Maintenance Small size, easy to field test. High quality pen type visual fault locator Easy identification of fiber break, bend, you can protect the fiber layer Complete mechanical connecting point detection and optimization Designed for fiber tracing, fiber routing and continuity checking Functions: Finding the breakpoints, poor connections, bending or cracking in fiber optic cables