Uni-T UT691-01 Visual Fault LocatorUni T UT691 01 visual fault locator The Uni T UT691 01 is a visual fault locator designed for detecting faults in optical fibers, identifying fibers, and performing maintenance work on optical installations. The device uses a red laser with a wavelength of 650 10 nm and offers both continuous and pulsed modes, which facilitates fault location and connection verification. An output power of at least 1 mW allows for operation with fiber optic sections