Features: brand new and high quality 1-5KM Long inspection distance;Operating mode: CW and Glint ; Steady power output; Sturdy and durable for shell Pen pattern design, convenient for use and carry Founctions: Locate the fiber failure, such as fracture and bend; Failure inspection in Otdr blind zone; Fiber recognition from for head face to end face; Mechanical transition point optimization Application for Telecom, CATV project; Pds construction and maintenance; Optical component manufacture and research; other fiber project. Specifications: Wavelength: 650nm Output Power: 1mw Connecter: general 2.5mm connecter( The available interface SC/for FC/ST) FC-LC fiber adapter : The available interface LC Frequency: 1Hz Power: AA 1.5V ( The product does not contain battery) Range:1-5Km Size: approx 17.5x2.6cm/6.89x1.02in Package Includes: 1x Visual Fault Locator 1x FC-LC Fiber adapter 1x Visual Fault Locator Bag 1x Lanyard note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Test pen used for a period of for time, if the light is weak, may be a ceramic tube normal wear or broken, can be written to replace unscrew the ceramic tube.