Fiber Optic Test Tool: Specifically designed for optical cable and wire maintenance, this VFL pen can locate defects on cables and visually search for fiber breaks. Contactless: Adopting a contactless connection method, there is no loss to the fiber and transmitter end area, and the output power is not affected by voltage fluctuations. Wide Application: With a 2.5mm universal interface, ensuring a wide range of applications, the output distance is up to 60km, very practical. Stable Output: This fiber optic source tester is energy-saving, can output power stably, and is a good tool for testing fiber optics. Easy to Carry: The fiber optic tester is compact, lightweight, comes with a pen case and lanyard, making it more convenient to carry. Specification: Item Type: Visual Fault Locator Material: Aluminum Universal Interface: 2.5mm (FC SC ST) Output Wavelength: 650nm ±10nm Optical Output Power: >60MW Fiber Optic Adapter: Universal Connector Output Range: 60km Operating Temperature: 0℃ to +60℃ Storage Temperature: -20℃ to +70℃ Battery Type: 2 x 1.5V AA Battery (Shipped without battery) Usage: Install with 2 AA batteries for immediate use. Package List: 1 x Visual Fault Locator 1 x Pen Case 1 x Lanyard 1 x User Manual Note: Do not aim at eyes.