1、Smart Testing: The visual fault locator can test optical fibre breakage and bending as well as achieving end to end fibre identification. 2、Broad Utility: Allows for broad application on telecommunication, CATV engineering and maintenance, integrated wiring construction, etc. 3、Reliable Work: Non contact connection guarantees no damage, and the output power is not likely to be affected by the voltage fluctuations. 4、Simpler Using: Simple operation together with 10km output distance largely simplifies the testing and greatly improves working efficiency. 5、Easy Carrying: Powered by 2pcs AA battery, which are not included, the lightweight and compact red light pen is simple to carry and store.