Feature: 1. Fiber Optic Pen: This pen type fiber visual fault locator is specially designed to maintain fiber optic cables and wiring, to effectively locate defects on cables. 2. Non Contact Connection: The meter will not damage the fiber and the end face of the transmitter, and the output power is not affected by voltage fluctuations. 3. Small and Portable: The fiber optic pen is small in size, light in weight, energy saving, and easy to carry for outdoor work. 4. Stable Output: The fiber optic pen has stable output power, the output distance is 50km, which is a good tool for fiber testing. 5. Aluminul Alloy Shell: The shell of this fiber red light pen is made of excellent aluminum alloy material, which is anti drop, has good durability. Specification: Item Type: VFL Red Light Pen Material: Aluminum Alloy Output Optical Power: More than 50MW Output Distance: 50km Output Wavelength: 650±10nm Operating Temperature: 0℃ to +60℃ Storage Temperature: -20℃ to +70℃ Battery Type: 2 x 1.5V AA battery (delivered without battery). Package List: 1 x VFL Red Light Pen1 x Pen Bag1 x Lanyard1 x Ceramic Core1 x Manual