OTDR Single Cable Fibre Launch Box 0S1 (9/125) Singlemode. An OTDR launch cable is used to eliminate the launch pulse created by an OTDR when testing fibre cables and networks. Without a launch cable, a test reading will not be accurate and events along the fibre could be missed. Watertight, crushproof, and dust proof - IP65 rated. Ideal for on site and harsh environment use. CAN BE CUSTOM MADE TO ANY LENGTH REQUIRED UP TO 1km WITH CONNECTORS OF YOUR CHOICE, PLEASE CALL OR EMAIL FOR PRICING.