Welcome to our store! 1. High Power & Long Distance: The optical fiber test pen boasts high power and a long measurable distance with constant, stable output. This visual fault locator emits a strong 650nm red light with powerful penetration, making leakage light at fault areas clearly visible. 2. Extended Use & Fast Charging: The product offers a long working time and short charging time. It's efficient and easy to use. Equipped with a 2.5mm universal connector, it tests both single-mode and multi-mode interface fiber optic cables. 3. Portable Design: Comes with a lanyard for convenient carrying. The red light output distance is 15 km, and it features a replaceable ceramic core design to extend its lifespan. 4. Stable Laser Output: High-efficiency power circuits ensure stable laser output, operating in both continuous wave and pulse modes. This 15MW visual fault locator is specifically designed for tracing, fiber routing, and continuity checking. 5. Easy Fiber Identification: The product simplifies the identification of fiber breaks, indicates signal directions and power within the fiber, displays relative core power, and signals the presence or absence of a signal (live or dark fiber). Item Type: Optical Fiber Test Pen Material: Engineering Plastic Purpose: Optical fiber test pen used to test if the optical fiber cable is functioning normally. Output Wavelength: 650nm Interface Type: 2.5mm / 0.1in universal adapter Working Temperature: -20--60℃ Storage Temperature: -40--85℃ Working Time: 10h Built-in Battery: Lithium battery Battery Capacity: 600mAh Package Contents: 1 x Test Pen 1 x USB Line 1 x Plastic Tube 1 x Lanyard