Feature:1. PORTABLE DESIGN: Visual fault tester, portable design, light and practical, easy to operate and carry, is a common tool for optical fiber testing.2. MAIN PURPOSE: Specially designed for maintaining optical cables and lines, used to locate cables and detect whether optical cables are defective.3. CONTACTLESS CONNECTION: The end faces of optical fiber and transmitter are not damaged, and the output power is not affected by voltage fluctuation.4. WORKING RANGE: The output wavelength of the red light test pen is 650nm 10nm, with stable output power and wide application range.5. ALUMINUM ALLOY: The pen shell is made of aluminum alloy, which is corrosion and abrasion resistant, and can be used in various environments.Specification:Item Type: Visual Fault LocatorModel: HT 50Material: Aluminum AlloyOutput Wavelength: 650nm10nmOptical Fiber Adapter: Universal ConnectorOutput Distance: Approx. 50KM / 164042ftOperating Temperature: 0-60Storage Temperature: -20-70Battery Type: 2 x 1.5V AA battery(not included battery).Package List:1 x Red Light Pen1 x Pen Bag1 x Lanyard1 x Use ManualNote:Do not aim at the eyes.