Among all visible optic spectrums, the middle wavelength made 532nm green line laser module generates the most visible and the brightest green laser light. It is getting the most sensitive color green laser light emission from beam aperture, thus generating the most accurate green reference line projection at a given work distance and all lighting occasions. The most special design of adjustable focus enables free adjustment of line thickness, and then making the highest level of accuracy line indication for all industrial and high tech line aligning use perfectly.