In various industrial and research use work fields, on consideration of good laser beam stability and long lasting work time, direct diode emission made device of 445nm blue laser diode module always gets the much preferred use than advanced 473nm blue DPSS laser system. It is being made with quite small size tube diameter, and low product cost. Even though it is not as bright as 473nm blue laser, it is enough for formal accuracy and brightness dot alignment works for a lot of application fields.