1、Ergonomic Design: Aluminum alloy body with non slip handle, comfortable in hand. Ergonomic design, compact and portable, easy to pick up with one hand. Replaceable ceramic tube core, more convenient to use. 2、Three Interfaces: Support three interfaces to meet different needs, with standard 2.5mm universal connector, can support FC interface, SC interface, ST interface. 3、Open Cover Type Pen Tip: Our test pen comes with a protection cover and uses an open cover type pen tip to prevent the head from getting damaged by dust. 4、Integrated Chip: This test pen uses a powerful light source integrated chip, integrating power management, signal modulation and switch control. 5、Steady Performance: The performance of this tester is very stable, with a stable output power, which means that it can improve the efficiency of the user. Item Type: Fiber Optic Visual Fault Locator Material: Aluminum alloy Output Wavelength: 650nm±10nm Batteries: 2 x AA batteries(Shipping without batteries) 1 x Fiber Optic Visual Fault Locator(Shipping Without Batteries) 1 x Hanging String 1 x Storage Bag 1 x Instruction Manual