1,3 Working Modes: The visual fault locator has 3 working modes of always on, fast flashing and slow flashing, making the optical fiber testing much easier. 2,Universal Interface: 2.5mm universal interface, supporting FC, SC, ST common interfaces, and the operating wavelength is 650 ± 10nm. 3,Red Light Source: Ensuring longer penetration distance and stable performance, the VFL also has removable metal pen tip for easy replacement of ceramic core. 4,Aluminum Alloy: Adopting premium aluminum alloy material, the pen type red light test pen is very convenient to carry for outdoor working. 5,Other Features: Multiple static protection, with optical port protection device, the operation is very simple, which enables high efficiency. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.