Welcome to our store! 1. MAIN USE: Pen-type visual fault locator is a device specially designed and maintained to locate defects in optical cables and wires. VFL is used to visually search for fiber breaks and detect defects in optical cables. 2. EASY TO USE: Simple operation along with 30km output distance greatly simplifies testing and significantly improves work efficiency. 3. ANTI INTERFERENCE: Non-contact connection, lossless fiber optics, and the transmitter's end face, output power are not affected by voltage fluctuations, giving you accurate and fast testing. 4. ALUMINUM ALLOY MATERIAL: Made of premium aluminum alloy material, this fiber optic cable meter is strong and sturdy, wear-resistant and lightweight, has a long service life. 5. WIDE APPLICATION: Enables wide application in telecommunications, CATV engineering and maintenance, integrated wiring engineering, etc. Item Type: Visual Fault Locator Material: Aluminum alloy Fiber Optic Adapter: Universal connector Output Distance: Approx. 30,000m / 98425.2ft Output Wavelength: 650 ± 10nm Operating Temperature: 0 to +60 ℃ Storage Temperature: -20 to +70 ℃ Battery Type: Built-in polymer lithium battery capacity 400 mah (shipped with built-in battery) 1 x Visual Fault Locator 1 x Manual 1 x USB Cable 1 x Ceramic core Customers are our top priority. If you encounter any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.