Feature: 1. MAIN FUNCTIONS: The pen visual fault detector is specially designed for the design and maintenance of optical cables and lines, used to locate cables and defects on the cable viewing, search for fiber breaks and use of optical cable defective equipment 2. PORTABLE AND CONVENIENT: Visual fault locator is small, light weight, energy saving, easy to carry and stable output power, which is a good tool for optical fiber testing 3. STABLE OUTPUT: Fiber optic visual fault locator adopt non contact connection, non destructive fiber and transmitter end face, output power is not affected by voltage fluctuations 4. SMALL FLASHLIGHT FUNCTION: The fiber optic source tester is equipped with a small LED bright flashlight, which is convenient for construction in dark conditions 5. UNIVERSAL ADAPTER: Fiber visual fault locator has a 2.5mm universal interface to meet various connector requirements. You can replace the adapter head and ceramic core by yourself Specification: Item Type: Visual Fault Locator Model: VFL 22M G 30 Battery: 2 x AAA batteries(not include) Output Wavelength: 650nm±10nm Fiber Optic Adapter: Universal connector Operating Temperature: -20~+60℃ Output Distance: 30KM. Package List: 1 x Visual Fault Locator