Feature: 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. Specification: Item Type: Visual Fault Locator Material: Aluminum alloy Battery: 2 x 1.5V AAA battery, shipped without battery. Application: For optical fiber communication detection. Operating Wavelength: 650 ± 10nm. Package List: 1 x Visual Fault Locator1 x User Manual