Check the listing for details. EXFO LFD-250B Live Fiber Detector. Condition: Used. Listed at 622.20 USD. The EXFO LFD-250B Live Fiber Detector is a powerful tool designed for fiber optic network maintenance and troubleshooting. Here are some key features and details about this device: Non-Intrusive Fiber Identification and Power Measurement: The LFD-250B enables technicians to identify a specific live fiber without having to disconnect it1. This results in no more network outages caused by inadequate fiber detection or identification, and a minimized need to access the network.Traffic Direction Verification: The device can identify the traffic direction on a live fiber.Dark Fiber Pinpointing: It can locate a particular dark fiber using tone recognition (270 Hz, 1 kHz, 2 kHz).Minimal Loss Induction: The LFD-250B induces minimal loss (≤1 dB), making it safe to be used in long-haul applications and on high-payload fibers.Step-Motor-Activated Bending: Unlike traditional live fiber detectors that use fixed-angle bending, the LFD-250B introduces step-motor-activated bending. This ensures the angle is automatically optimized for each fiber type and each single-mode wavelength.Fast Test Time: The device offers three times faster test time (