Feature:1. SC/FC/LC connectors and UPC/for APC polishing modes are available. Designed to help test fiber optic cables when using OTDR.2. The use of OTDR transmitting fiber ring in conjunction with an optical time domain reflectometer (OTDR) helps to minimize the impact of OTDR transmitting pulses on measurement uncertainty.3. Pulse suppressor, launches box, delay line, installation/testing, training, calibration. The composite latches is used for reliable sealing and easy opening with locking feature.4. Nonmetallic structures will not dent, corrode or conduct electricity. Waterproof and dustproof, the device can be used in almost all environments.5. The automatic purge valve can be used for changes in altitude and temperature, which has stable and professional performance.Specification:Item Type: OTDR Extension Cord Material: ABS Mechanical & Environmental Characteristics: Packaging: Rugged, hard-shell transit case Storage Temperature:-40 to +85Operating Temperature:-40 to +85 Humidity:0 to 95%, non-condensing Fiber & Connector Characteristics Fiber Types:G652D Fiber Length (m): Approx. 1000m/3280.8ftTypical Loss:<0.5dB @ 1310 for 1000 metersConnector Type: SCPolish: UPC/for APC Return Loss: UPC>=50dB, for APC>=60dB, PC>=35dB Repeatability (dB):<=0.2 (1000 times)Exchangeability (dB):<=0.2.Package List:1 x OTDR Extension Cord Box1 x Buckle Strap