The LFI 110 Live Fiber Identifier Accessory is a rugged accessory tool that is designed to fit onto the ODM RP 4XX series optical power meters. This useful device allows the detection of active channels or 2kHz tones on any singlemode network. The LFI 110 is designed to accommodate 250 micron, 900 micron, 2mm or 3mm jacketed fibers.