Features Testing Tools: Mainly applied to make up for the blind spot of OTDR test to detect the dead zone as well as eliminating it. Reliable Work: Designed to have a long length up to 500 meter, also has a low loss that is less than or equal to 0.5dBm/km. Great Sealing: There is no splice in the middle of the fibre, and the excellent sealing is waterproof and explosion proof. Good Material: The application of high quality fibre and plastic materials allows for good durability for long term using. Easy Carrying: Comes with a compact size and a light weight, the convenient carrying and storage will simplify your working. Specification: Item Type: OTDR Launch Cable Box Material: Fibre, plastic.  Length: Approx. 500m / 1640.42ft Features: 1. It is mainly used to make up for the blind spot of OTDR test. There is no splice in the middle of the optical fibre. It is small in size, light in weight and easy to carry.  2. Single mode 9/125.  3. The loss is less than or equal to 0.5dBm/km.  4. With excellent sealing performance, waterproof, anti fouling and explosion proof.  Package List: 1 x OTDR Extension Cable 1 x Storage Box1 x Storage Bag Note: Pay attention to safety protection when using. Package List 1 x OTDR Extension Cable 1 x Storage Box 1 x Storage Bag