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How can adjustable focus 635nm red dot laser module work precisely? Either the measurement work is processing at long distance a long time, it is far more enough to only use a simple red laser pointer, but making even better job with an adjustable focus lens made 635nm red dot laser module. After easy connects with 5V,9V DC power supply within wide range output power of 50mW to 100mW, it begins to work with constant red laser beam and red dot emission at quite a long work distance effectively. The usual use of a 635nm red dot laser module is always continuing for a quite long time. Only if it gets proper installation and adjustment to correct position, it brings users the lowest price and the most reliable dot indication for all machinery processing works effectively. Applications: laser marking, laser engraving, drilling system, red laser sight, military targeting and high tech work etc. https://www.berlinlasers.com/635nm-red-dot-laser-module