Pen Type Vfl Are Compact but Powerful Visual Fault Locator, with an Output Power Up to 10mw, Could Be Used to Locate Bends & Breaks in Jacked or Bare Fiber Within 10km. It Could Also Be Used to Identify the Connectors in Patch Panels and Identify the Fibers During Splicing Operation. Pen-Type Red Light Emitting Device by Using 650nm Semiconductor Laser to Emit Red Light, Stable, and Optical Interface Is Connected into the Multimode and Single-Mode Optical Fiber Cable, Optical Fiber Jumper Fault Detection Function.optical Engineering Construction, Network Maintenance, Fiber Optical Devices Indispensable Production and Research Tools 10mw Pen Type Visual Fault Locator Fiber Optic Cable Tester Meter for Catv 10-12km Parameters: Type:10mw Output Wavelength:650nm ± 2hz Output Power: More Than 10mw Dynamic Distance:less Than 10km Connector:2.5mm Universal Commector Laser Type:ld Power Supply:aa*2(not Included) Working Tamperature:-10 Centigrade+60 Centigrade Storage Temperature:-20 Centigrade+70 Centigrade