In a lot of industrial and high tech line measuring work fields, either it is pointing for long time and long distance, it is not workable at all to only rely on manual line printing or line drawing works. Not able to rely on any manual labor force input, 30mW 515nm green laser line generator just makes an easy and quick line projection after its connects with an AC/DC adapter. When it is being made with basic cooling system and constant power source, this green line laser module should only be

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