Feature: 1. Non Contacting Type: This fiber optic tester adopts a non contacting connection, which does not damage the end faces of the fiber and transmitter. The output power remains unaffected by voltage fluctuations, helping to improve testing efficiency 2. Output Parameters: This visual fault locator features a test distance of up to 30 kilometers and an output wavelength of 650nm+ 10nm, providing stable output power, efficient and energy saving 3. User Friendly: Designed for portability, this fiber optic test pen features a non slip handle for convenient and comfortable grip. It is compact and lightweight, making it easy to use anytime, anywhere 4. Product Features: Equipped with a standard 2.5mm universal fiber optic connector, it is suitable for various types of fibers. It features a strong light source, quick on off control, high stability, and efficiency 5. Versatile Usage: This pen type fiber tester is specifically designed for maintaining fiber optic cables and circuits, locating defects on fibers and cables, as well as searching for broken fibers and faulty equipment Specification: Item Type: Fiber Optic Test Pen Material: Aluminium Alloy VFL Test Distance: 30KM Output Wavelength: 650nm + 10nm Optical Fiber Adapter: Universal Connector Operating Temperature: 0 60 celsius Storage Temperature: 20 70 celsius Battery: 1 x Rechargeable Li Battery 500mAh (built in). Package List: 1 x Visual Fault Locator1 x Hanging Rope1 x USB C Charging Cable1 x User Manual