Feature: 1. ACCURATE IDENTIFICATION: Visual fault locator can easily and accurately detect and locate fiber optic breaks, poor connections, bends, or ruptures. Operate in continuous wave or pulse mode. VFL emits 650nm red light for fiber tracking and positioning, and breaks or malfunctions can refract light in the fiber. 2. EXCELLENT FUNCTION: Fiber optic tester has multiple functions such as constant output power, low battery warning, long battery life, and remote detection. Effectively conduct fiber optic wiring and continuity checks to generate bright light around the faulty area. 3. WIDELY USED: A universal 2.5mm connector designed specifically for ST, SC, and FC, which can interfere in circular and square shapes of different optical cables and can be used for testing single mode and multimode cables. Suitable for integrated wiring systems and fiber optic engineering; CATV engineering optical network maintenance; Optical communication; Optical measurement drive engineering; Production and research of optical devices. 4. DETECTION DISTANCE: Visual fault locator has a strong light source output power of 30mW, and a constant output power. The strong red light propagates 30 kilometers (maximum) in the optical cable. The high effective power circuit provides stable power, continuous wave, and pulse modes. 5. PRACTICAL DESIGN: Small in size and light in weight, the pen style design makes VFL easy to carry, and optical fiber faults can be easily detected through a visual fault locator. The stainless steel head and aluminum body design can prevent collisions and dust, and the shell grounding design can prevent effective ESD damage. 6. LED ILLUMINATED FLASHLIGHT: High brightness LED flashlight function can easily cope with dim environments and efficiently carry out construction. Specification: Item Type: Red Light Pen Mode: SGV30 Material: ABS Output Fiber Power: Greater than 30mW Output Wavelength: 650nm Interface: Approx. 2.5mm / 0.1in universal Effective Distance: Approx. 30000m / 98425.2ft Operating Temperature: -20 to +60 Storage Temperature: -40 to +85 Power Supply Battery Type: Lithium ion battery 900mAh (built in carrying) . Package List: 1 x Red Light Pen 1 x Manual 1 x Ceramic Core 1 x Charging Cable 1 x Hanging Rope