Welcome to our store! Non-Contact: Our VFL red light pen tester features a non-contact connection, ensuring non-destructive testing of optical fibers and transmitter ends. The output power is unaffected by voltage fluctuations. Functional Description: The pen-type visual fault locator is a device specifically designed for the design and maintenance of optical cables and lines. It's used to locate cables and defects in cables, visually identify fiber breaks, and pinpoint faulty optical cables. Output Distance: This pen-type VFL red light tester boasts a 50km output distance with an output wavelength of 650±10nm. Kit Contents: The VFL visual fault locator red light pen kit includes 1 VFL, 1 ceramic ferrule, 1 adapter, 1 storage bag, and 1 strap. Energy-Saving and Portable: With its small size and light weight, this VFL visual fault locator is energy-saving and easy to carry. Its stable output power makes it an excellent tool for optical fiber testing. Item Type: VFL Red Light Pen Model: HT50 Material: Aluminum Alloy Fiber Optic Adapter: Universal Connector Output Distance: 50km Output Wavelength: 650±10nm Operating Temperature: 0 - +60 ℃ Storage Temperature: -20 - +70 ℃ Battery Type: Requires 2 x AA batteries (not included) 1 x Red Light Pen 1 x Instruction Manual 1 x Ceramic Ferrule 1 x Adapter 1 x Red Light Pen Pouch 1 x Lanyard Customer satisfaction is our top priority. If you encounter any issues with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We are committed to providing you with the best after-sales service.