Unless the use of any manual line drawing work, the genuine use of a 532nm green line laser alignment with 5V, 9V 1000mA DC power supply just makes sure of constant green laser beam and green line emission from laser beam aperture. Being made with a qualified glass coated lens or separate crystal lens within 10 to 110 degree, after beam stability test up to 24 hours, it achieves high quality green laser light emission and high fineness green line emission within 0.5 to 6 meters. It enables easy installation and high precision line measurement for laser cutting, textile garment processing, sand milling, lumber machine, and high tech work etc.
https://www.berlinlasers.com/532nm-green-line-projecting-laser-alignment
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