Ensure flawless fiber optic connections with our advanced Visual Fault Locator! Powered by a constant current source, this essential tool efficiently detects fiber faults by injecting light into both multimode and single-mode fibers when connected to the optical interface. Enjoy multiple power supply options, including alkaline batteries, power banks, computers, adapters, and even rechargeable batteries. The built-in illumination function makes line inspection and construction easy in dark environments such as outdoor settings, data centers, and during nighttime operations. Designed with ergonomics in mind, this visual fault locator is lightweight, comfortable to hold, and user-friendly, ensuring effortless handling. It's an indispensable tool for fiber engineering construction, fiber network maintenance, and the production and research of optical components. Features a 30KM test distance, ≤170mA working current, >5h battery life, 3 adjustable gear outputs, 650nm output wavelength, and a 2.5mm universal adapter interface. Powered by 2 AAA batteries (not included). Operates in temperatures from -20℃ to +60℃ (non-condensing) and stores from -40℃ to +85℃.