Welcome to our store! 1. Ergonomic Design: Aluminum alloy body with a 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: Supports three interfaces to meet different needs, with a standard 2.5mm universal connector, it can support FC interface, SC interface, ST interface. 3. Open Cap Type Pen Tip: Our test pen comes with a protective cover and uses an open cap type pen tip to prevent damage to the head from dust. 4. Integrated Chip: This test pen uses a powerful integrated chip with a light source, which integrates power management, signal modulation, and switch control. 5. 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 Lanyard 1 x Storage Bag 1 x User Manual Customers are our top priority. If you find any issues with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.