What could be causing the optical power meter to display nano

Clean and inspect the fiber connectors, as dirt or damage can lead to power loss, and ensure the fiber isn't bent or twisted. At its core, the device consists of: The power meter does not evaluate. Monitoring optical power levels is essential because even slight deviations can significantly affect the stability, quality, and availability of optical transmission services. Optical networks rely on precise power balance—too much power can damage receivers or distort signals, while insufficient. A power meter is only as accurate as the technician using it. The space-saving, battery powered design and compatibility to all. [pdf]