UT691 visual fault locator is designed for optical fiber fault detection and locating, end-to-end optical fiber identification, and more. It is IP54 rated, uses 650nm visible red light with 2emitting modes of continuous or pulse. With the functions of APO, battery status indicator, and flashlight, it can be widely used in the fields of optical cable construction and maintenance, optical fiber communication or sensing, optical CATV, and so on. Features: Lightning Function: High Brightness LED Concentrating Flashlight Power Status: four blue LED Instruction Laser Status Indicator Automatic Shut down USB Charging