1. MAIN PURPOSE: The visual fault detector is specially designed for the design and maintenance of optical fiber, to locate the break and fault on the optical cable. 2. LESS INTERFRENCE: Contact connection, fiber optic loss and transmitter end face, the output power is not affected by voltage fluctuations. 3. WORKING RANGE: The output wavelength of the optical fiber detector is 650nm 10nm, the output distance is 15km, with less interference, the detector is stable and reliable. 4. PORTABLE DESIGN: The visual fault detector is a portable design, small and compact, with stable power output, suitable for indoor and outdoor use. 5. ALUMINUM SHELL: The shell of the fiber optic test pen is made of aluminum, lightweight, corrosion and abrasion resistant, ensuring long-term use. Specification: Item Type: Visual Flaw Detector. Model: HT 15 Material: Aluminum Universal interface: 2.5mm (FC SC ST) Output wavelength: 650nm 10nm Optical output power: >15mw Optical fiber adapter: universal connector Output distance: 15km Operating temperature: 0-60 Storage temperature: -20-70 Battery type: 2 x 1.5V AA batteries (not included) Package list: 1 x visual fault detector 1 x pen bag 1 lanyard 1 user manual Note: Do not aim at the eyes.