Handheld Optical Power Meter 1. High sensitivity, large dynamic range 2. ... BD503 Handheld Optical Power MeterDescriptionsBD503 Handheld Optical Power Meter is a self-developed test instrument which is ... response, without warm-up and reduce testing time4. Low-voltage display function5. Optional auto-shutdown feature6. User self- ... battery, carry bag, user’s guide. optical power meter tester price