4 In 1 functionality: The Precision Power Meter 4 In 1 Multifunctional Optical Pen Tester combines four essential tools into one device for optical power measurement, optical pen testing, and LAN cable fault detection. Accurate measurements: The optical power meter provides precise readings to diagnose network issues quickly and maintain the overall performance and reliability of connections. Userfriendly interface: Clear LCD display enables easy reading of results in varying lighting conditions. Compact and portable design: Lightweight and portable, designed for technicians on the go. Use scenarios: Fiber optic link installation and maintenance: verify optical power levels to ensure proper link budgets. LAN cable fault detection on site: identify disconnections or cable failures quickly to isolate issues. Field service and troubleshooting: carry the device for rapid diagnostics and performance verification in remote locations.