Feature: 1. Fiber Optic Test Tool: Specially designed for optical cable and line maintenance, this VFL pen can locate defects on cables and visually identify fiber breaks. 2. Non-Contact Design: Utilizes a non-contact connection method, preventing damage to the optical fiber and transmitter end face, with output power unaffected by voltage fluctuations. 3. Wide Application: Features a 2.5mm universal interface compatible with FC, SC, and ST connectors, supporting an output distance of up to 60km, offering broad practical use. 4. Stable Output: Energy-saving fiber optic source tester provides stable power output, making it a reliable tool for fiber optic testing. 5. Portable Design: Compact size and lightweight construction, includes a pen bag and lanyard for easy and convenient carrying. Specification: Item Type: Visual Fault Locator Material: Aluminum Universal Interface: 2.5mm (FC, SC, ST) Output Wavelength: 650nm ±10nm Output Optical Power: >60mW Optical Fiber Adapter: Universal connector Output Distance: 60km Operating Temperature: 0°C to +60°C Storage Temperature: -20°C to +70°C Battery Type: 2 x 1.5V AA battery (battery not included) Package List: 1 x Visual Fault Locator 1 x Pen Bag 1 x Lanyard 1 x Manual Note: Do not aim at eyes.