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Different from a simple blue laser pointer, the real use of a Berlinlasers 445nm blue laser diode module is making long lasting blue laser beam and blue dot projection from laser beam aperture. It gets no time spending on battery changing, but makes constant dot alignment within 10 hours. After its correct use of output power within 50mW to 100mW, unless it is pointing under sunlight, it brings users quite satisfied dot measurement for laser show, laser displaying, laser communication, high tech and lab experiment work etc. https://www.berlinlasers.com/445nm-blue-laser-diode-module

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