Efficiently identifies the traffic direction and frequency (270Hz, 1KHz, 2KHz) with an audible warning. LCD clearly displays the relative core power, signal direction, and battery life. Reversible adapter has one side for 2 mm and 3 mm fiber optic cables, and the opposite side is used for 250 µm and 900µm fiber. Built-in VFL allows you to find faults in fiber cables quickly and eas... https://jonard.com/fiber-optics/test-equipment