... and easy to operate BD503 Handheld Optical Power MeterDescriptions BD503 Handheld Optical Power Meter is a self developed test instrument ... . Maintenance CATV3. Test Lab of Fiber Optic4. Optical fiber sensorsSpecifications TypeBD503ABD503BWavelength(nm)800~1650DetectorInGaAsOptical ConnectorFC SC ST ... ,battery, carry bag, user’s guide. Optical Power Meter,Fiber Power Meter,Optical Power Detector