Ergonomic Design: Aluminum alloy body with a non-slip handle, comfortable to hold. Ergonomic design, compact and portable, easy to pick up with one hand. Replaceable ceramic pipeline, more convenient to use. Three Interfaces: Supports three interfaces to meet different needs, with a standard 2.5mm universal connector, it can support FC interface, SC interface, ST interface. Open Type Pen Tip: Our test pen comes with a protective cap and uses an open type pen tip to prevent damage to the head from dust. Integrated Chip: This test pen uses a powerful light source integrated chip that integrates power management, signal modulation, and switching control. Stable Performance: The performance of this tester is very stable, with a stable output power, which means it can improve user efficiency. Item Type: Fiber Optic Visual Fault Locator Material: Aluminum Alloy Output Wavelength: 650nm±10nm Batteries: 2 x AA batteries (Shipped without batteries) 1 x Fiber Optic Visual Fault Locator (Shipped without batteries) 1 x Hanging Lanyard 1 x Storage Bag 1 x User Manual Satisfaction Guarantee: Customers are our top priority. If you find any problems with the product, please contact the seller immediately. We strive to provide satisfactory customer service.