Feature: 1. The optical fiber test pen has high power, long measurable distance. Constant and stable output power. This visual fault locator will emit a 650mm bright red light which has strong penetrating power, so that the leakage lightat fault area is clearly visible 2. The product has long working time, short charging time. Efficient and easy to use. The product owns 2.5mm universal connector, test for both single‑mode and multi‑mode interface fiber optic cables 3. Equipped with a lanyard, making it more convenient to carry. Red light output distance 15KM, replaceable ceramic core design to prolong the lifetime. 4. High effective power circuits allow for stable laser power, operates in bothcontinuous wave and pulse mode. This 15MW visual fault locator is specially designed for tracing,fiber routing and continuity checking 5. The product has easy identification of fiber break, indicate the signal directions and power in fiber,displays the relative core power and indicate the signal presence or absence(Live or dark fiber). Specification: Item Type: Optical Fiber Test PenMaterial: Engineering plasticPurpose: Optical fiber test pen is used to test whether the optical fiber cable can work normallyOutput Wavelength: 650mmInterface Type: 2.5mm / 0.1in universal adapterWorking Temperature: -20--60℃Storage Temperature: -40--85℃Working Hours: 10hBuilt-In Battery: Lithium batteryBattery Capacity: 600mAh. Package List: 1 x Test Pen1 x USB Line1 x Plastic Pipe1 x Lanyard