Features 【FIBER FAULT DETECTION & 30KM RANGE】This visual fault locator efficiently detects fiber faults with a 30KM test range, making it ideal for identifying breaks, bends, and other issues in multimode and single-mode fibers. 【MULTIPLE POWER SUPPLY OPTIONS & FLEXIBILITY】Supporting batteries, power banks, and adapters, this fiber optic tester ensures uninterrupted in various environments, providing flexibility for fieldwork and maintenance. 【ILLUMINATION FUNCTION & DARK ENVIRONMENT USE】Equipped with a built-in lighting function, this fiber visual fault tester facilitates inspections and construction in dark environments like data centers, outdoor settings, and nighttime operations. 【ERGONOMIC DESIGN & USER-FRIENDLY】Designed with an ergonomic and lightweight structure, this fiber fault locator is comfortable to handle and user-friendly, ensuring ease of use during extended testing sessions. 【WIDE USAGE & PROFESSIONAL TOOL】An essential tool for fiber network maintenance, construction, and optical component production, this fiber optic testing pen is indispensable for professionals in telecommunications and fiber engineering. 1. [Fiber Fault Detection] Driven by a constant current source, this visual fault locator efficiently detects fiber faults by entering multimode and single mode fibers when connected to the optical interface. 2. [Multiple Power Supply Options] Support various power supply methods such as batteries, power banks, computers, adapters, and can batteries. 3. [Illumination Function] This fiber visual fault tester facilitates line inspection and construction in dark environments such as outdoor settings, data centers, and night time operations. 4. [Ergonomic Design] This visual fault locator is lightweight, ergonomic designed, comfortable to use, user friendly, ensuring ease of handling. 5. [Wide Usage] This is an indispensable tool in fiber engineering construction, fiber network maintenance, and optical component production and research. Spec: Item Type: Visual Fault Locator Material: ABS Test Distance: 30KM Working Current: ≤170mA Battery Life: >5h Gear Output: 3 adjustable gears Output Wavelength: 650nm Interface Type: 2.5mm universal adapter Power Type: AAA battery x 2 (shipped without battery) Storage Temperature: -40℃ to +85℃ Working Temperature: -20℃ to +60℃ (without condensation) How to Use: Operate according to the user manual. PackageList: 1 x Visual Fault Locator 1 x Ceramic Sleeve 1 x User Manual Package List 1 x Visual Fault Locator 1 x Ceramic Sleeve 1 x User Manual