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What are the readings on the screen of an optical power meter
Your power meter displays results in dBm, which is an absolute measurement of optical power referenced to one milliwatt. Negative numbers mean less than 1 milliwatt: -10 dBm is 0. 01. An optical power meter measures the strength of light traveling through a fiber optic cable, giving you a reading in dBm (decibels relative to one milliwatt). Other general purpose light power measuring devices are usually called radiometers, photometers, laser power. This ensures accurate readings for the signal you are testing. Regularly calibrate your power meter.