Features: Compact & Portable: This visual fault detector is small, lightweight, energy-saving, and easy to carry, offering stable output for efficient fiber testing. Multi-Purpose Tool: Specifically designed for fiber optic cable line maintenance, it's perfect for locating cable defects and visually identifying fiber breaks or faulty cables in use. Unaffected Performance: Features a non-contact connection that ensures lossless fiber and transmitter end-face, with output power unaffected by voltage fluctuations. Technical Specifications: Constructed from scratch-resistant aluminum, it boasts an output wavelength of 650nm±10nm, optical output power >30MW, and an impressive output distance of 30KM. Complete with Accessories: Comes with a convenient pen case and lanyard, making it easy to install and use. The comprehensive accessories ensure a hassle-free experience. Specification: Item Type: Visual Fault Detector Model: HT-30 Material: Aluminum Output Wavelength: 650nm±10nm Output Optical Power: >30MW Fiber Adapter: Universal connector Output Distance: 30KM Service Thermometer: 0-+60℃ Storage Temperature: -20-+70℃ Battery Type: 2 x 1.5V AA battery (not included). Package List: 1 x Visual Fault Detector 1 x Pen Case 1 x Lanyard 1 x User Manual Note: Keep away from eyes.