Feature 120KM TESTING: This fiber visual fault locator has a longer penetration distance of 20KM, with stable performance, and long service life. 22.5MM CONNECTOR: This visual fault locator uses a universal 2.5MM connector and supports common interfaces for FC, SC, and ST. 3DETACHABLE DESIGN: The metal pen head of the fiber optic source tester is detachable, making it easy to replace the ceramic core. 4WORK PRINCIPLE: The VFL pen is driven by constant current source and connected to the optical interface to enter multimode and single mode optical fibers, achieving fault detection function. 5MULTI PURPOSE: This red light pen is an indispensable tool for fiber optic engineering construction, fiber optic network maintenance, and optical device production and research.Item Type: Fiber Optic Visual Fault LocatorMaterial: ABSOutput Distance: 20KMWavelength: 650NM10NMFiber Optic Connector: Universal 2.5MM ConnectorWorking Temperature: +10 to +45Flashing Frequency: 1HZWorking Humidity: 30% to 90%Battery Type: AAA Battery x 2 (Not Included) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Fiber Optic Visual Fault Locator1 x Storage Bag