Welcome to our store! Quick Fault Detection: This red light pen quickly detects and locates fiber optic faults, making maintenance convenient, efficient, and practical. Excellent Integrated Chip: Features an integrated chip that combines power management, an imported laser head, and high thermal conductivity switch control for a strong light source. Multi-Purpose: With a standard 2.5mm universal connector, it supports FC, SC, and ST interfaces to meet your various needs. Laser Head Protection: Designed with a laser head protector to prevent damage from dust and maintain performance. Ergonomic Design: The ceramic tube core is replaceable, and the pen body is made of durable plastic, providing a comfortable grip, lightweight portability, and ease of use. Output Wavelength: 650nm±10nm Batteries: 2 x AA batteries (not included) Includes: 1 x Visual Fault Locator 1 x Lanyard 1 x Storage Bag 1 x Manual Customer satisfaction is our top priority. If you encounter any issues with your product upon receipt, such as damage or incorrect quantity, please contact us immediately. We are committed to providing you with the best after-sales service.