【ACCURATE IDENTIFICATION】 This fiber optic cable tester can easily and accurately detect and locate fiber breaks, bad connections, bending, or cracks. Specifically designed for optical cable and line maintenance, this VFL pen can pinpoint cable faults and visually trace fiber breaks. 【WIRELESS CONNECTION】 The visual fiber fault locator utilizes a wireless connection, ensuring no loss to the optical fiber and transmitter end face, and the output power is not affected by voltage fluctuations. The VFL tester set is used for optical fiber tracing, optical fiber routing, and continuity inspection. 【DETECTION DISTANCE】 This 60mW fiber optic cable testing tool features a strong red light battery output, with high-efficiency circuits enabling stable power supply. This fiber optic source tester is energy-saving and delivers power stably, making it a great tool for optical fiber testing. 【WIDE APPLICATION】 With a 2.5mm universal interface, it ensures a wide range of applications, with an output distance of up to 60km, making it highly practical. The detector's connector is designed to be compatible with ST, SC, FC interfaces in both circular and square shapes for various fiber optic cables. 【ORDER NOW, WORRY-FREE】 Customer satisfaction is our top priority. We are so confident in the quality of our products that we offer a one-year warranty! We will provide you with a professional and detailed response within 24 hours. Click to buy now! Specification Type: Visual Fault Locator Material: Aluminum Universal Interface: 2.5mm (FC SC ST) Output Wavelength: 650nm ± 10nm Output Optical Power: > 60MW Battery Type: 2 x 1.5V AA Batteries (battery not included) Fiber Optic Adapter: Universal Connector Output Distance: 60KM Operating Temperature: 0℃ to +60℃