Feature: 1. Fiber Optic Test Tool: Specially designed for optical cables and lines maintenance, this VFL pen could locate defects on cables, visually search for fiber breaks. 2. Non Contact: Adopt non contact connection way, there is no loss for optical fiber and transmitter end face, and the output power is not affected by voltage fluctuation. 3. Wide Application: With 2.5mm universal interface, ensures a wide range of applications, the output distance is up to 60km, highly practical. 4. Stable Output: This fiber optic source tester is energy saving, could output power stably, is a good tool for optical fiber testing. 5. Easy Carrying: The fiber optic tester is compact size, light weight, comes with pen bag and lanyard, more convenient for carrying around. Specification: Item Type: Visual Fault Locator Material: Aluminum Universal Interface: 2.5mm (FC SC ST) Output Wavelength: 650nm ±10nm Output Optical Power: >60MW Optical Fiber Adapter: Universal connector Output Distance: 60KM Operating Temperature: 0℃ to +60℃ Storage temperature: -20℃ to +70℃ Battery Type: 2 x 1.5V AA battery (shipped without battery). Package List: 1 x Visual Fault Locator1 x Pen Bag1 x Lanyard1 x Manual Note: Do not aim at eyes.