1、Quick Fault Detection: This red light pen can quickly detect and locate the fault point of the optical fiber, convenient for maintenance, very efficient and practical. 2、Excellent Integrated Chip: Adopt integrated chip, which integrates power management, imported laser head, and high thermal conductivity switch conol, provides song light source. 3、Multi Purpose: Featuring standard 2.5mm universal connector, supports FC interface, SC interface, ST interface, to meet your different needs. 4、Laser Head Protection: Designed with a laser head protective cover, prevent the laser head from being damaged by dust and affecting performance. 5、Ergonomic Design: The ceramic tube core can be replaced by yourself, the pen body is made of plastic material, sturdy, comfor to grip, lightweight and por, easy to use.Item Type:VisualFaultLocatorMaterial: ABSOutput Wavelength: 650nm±10nmBatteries: 2 x AA batteries shipped without batteries 1 xVisualFaultLocator1 x Lanyard1 x Storage Bag1 x Manual