Precision Power Meter 4in1 Multifunctional Optical Pen Tester and Disconnected LAN Cable Failure Tester 4in1 functionality: A single handheld device that combines multiple essential testing tools into one unit, including an optical power meter, an optical pen tester, and a disconnected LAN cable failure tester. Accurate measurements: Provides precise optical power readings to help diagnose network issues and maintain the reliability and performance of connections. Userfriendly interface: Clear LCD display allows easy reading of results in various lighting conditions. Compact and portable design: Lightweight and pocketfriendly form factor designed for technicians who work across sites. Key attributes: Functions cover optical power measurement, optical testing, and LAN cable fault testing; designed to support standard network and fiber testing workflows; compact size delivers convenient field testing and quick diagnostics. Use scenarios: Onsite fiber optic installation: verify optical power levels and inspect connections to ensure proper transmission. LAN cable troubleshooting in offices or data centers: assess cable continuity and identify disconnections or faults. Field maintenance checks: perform quick validation of link integrity during routine inspections or service visits.