Not spending extra time on alkaline battery power chance, in order to make continuous dot projection for all precise machinery processing works, it should be a better job to operate a DC power supply made 532nm green dot laser module. Employed by advanced 532nm green DPSS laser system within 5mW to 100mW and thermal emitting system inside a high duration metal housing tube, it achieves superior nice thermal stabilization and ultra clear green dot projection in continuous use. 
Cooperating with a glass coated lens and glass window inside a high duration metal housing tube, this dot laser module is working well with ultra clear and precise green dot projection at long extending distance. Only according to real work distance and lighting occasion, it gets correct use of output power and makes ultra clear green dot projection as long as 25 meters. Unless it is used under sunlight, it always brings users quite satisfied dot measuring results for all precise machinery processing work fields effectively. 
Applications: drilling system, laser marking, laser engraving, scientific experiment and lab experiment etc