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Any time users are looking for the highest level of accuracy line projection at different work distances, it is just out of hand reaching. However, under operation of constant technical innovation of 445nm blue laser diode tech and a qualified separate crystal lens with wide fan angles, it is created into a quite practically used device of a uniform beam 445nm blue line laser module. Whenever it gets basic use of thermal system inside a durable metal housing tube, within quite long work distance and other formal lighting working occa... more