1. Threeinone device: optical power meter, fiber tester, and network cable analyzer, designed for installation and maintenance tasks. 2. The fiber optic tester can measure the wavelength range from 70dbm to 10dbm with accuracy. 3. Dual power detects fiber breaks over long distances, while safe mode uses red light for shorter distance testing. 4. Intelligent cable tester identifies opens, shorts, and crossed pairs with LED indicators, and includes adapters for versatile fiber optic connections. Key benefits Allinone solution reduces the need for separate tools, saving space and simplifying training. accuracy across a wide measurement range (70dbm to 10dbm) supports reliable fault finding and verification. Longdistance fiber break detection plus a safe mode for shorter tests offer flexible testing in various environments. Clear, immediate feedback with LED indicators and readytouse adapters improves troubleshooting speed. Adapters included for versatile fiber optic connections enhance compatibility with different link configurations. Use scenarios Installation and commissioning of fiber networks in data centers, campuses, or telecom rooms: verify power levels, continuity, and link integrity with a single tool. Field maintenance of longhaul fiber links: locate and diagnose breaks quickly using dual power detection, then switch to safe mode for nearby testing. Cable verification and troubleshooting in network cabinets: identify opens, shorts, and crossed pairs efficiently, with adapters that support multiple connector types.