The 650nm Visual Pen Fault Detector has been specially designed for field workers to provide you with an effective and essential tool. A cost-effective solution for checking fiber optic cables and checking optical network continuity during and after installation. Find the breakpoint, bad connections, knots or breaks in fiber optic cables. < p>Works with either CW or pulsed light output power: 30 mW (30-32 km). Infrared wavelength: 650 nm. Infrared applications: single mode/multimode. Connectors: 2.5mm general connection (SC/FC/ST interface available). Features: Continuous wave and pulse mode, constant output. Power supply: 2 AAA batteries. Housing material: aluminum. Dimensions: length: 175 mm, diameter: 26 mm.