SainSonic TL232 10mw Visual Fault Locator, 2.5mm Universal Connector, Fiber Optic Cable Tester Meter for CATV Telecommunications Engineering Maintenance Easy and Accurate Identification  It can easily and accurately detect and locate fiber breaks, poor connections, bending or cracking. The detector will emit a 650nm bright red light for fiber tracing, breaks or faults in the fiber will refract the light, creating a bright glow around the faulty area. 2.5mm Universal Connector  the connector of the detector is compatibly designed for ST, SC, FC interferes both in circle and square shape of different fiber optic cables. Crash-proof and Dust-proof Design for Laser Head  It is designed with stainless steel head to prevent crash and dust, and the case ground design prevents ESD damage efficiently. New Copper Sleeve Materials  It adopts anti-cracking copper sleeve to replace the ceramics materials connector port, making it more durable and rugged. Practical Design and Excellent Function  Small size and lightweight, it is portable and easy for field test with multiple functions such as constant output power, lower battery warning, long battery life and long distance detection.