UT691 visual fault locator is designed for optical fiber fault detection and locating, end to endoptical fiber identification and more. It is IP54 rated, uses 650nm visible redlight with 2emitting modes of continuous or pulse. With the functions of APO, battery statusindicator and flashlight, it can be widely used in the fields of optical cable constructionand maintenance, optical fiber communication or sensing, optical CATV and so on.