The Fluke Networks' three-jumper test reference cord set contains a duplex multimode cord with scratch-resistant hardened surfaces and polarity indicators. This duplex multimode three-jumper test reference cord is for use with Fluke Networks fiber installation testing devices, such as the DTX CableAnalyzer Series (sold separately). The scratch-resistant hardened surfaces on the connectors enable numerous insertions without degradation in loss performance. The cords indicate polarity with a red boot on the end where light enters and a black boot on the end where light exits for ease of correct usage. They have a 50 μm core diameter, and are available for use with LC, SC, or ST test adapters (sold separately). The test reference cords meet International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC) 14763-3 requirements that test reference cords do not exceed 0.10 dB for multimode at the connectors.