The advanced use of a qualified glass coated lens is cooperating with a glass window, after up to 24 hours aging preventing and beam stability tests, this 635nm red laser diode module is working well with high transmittance red laser light and highly clear red dot alignment within the maximum work distance of 25 meters. Only after its easy adjustment of both dot diameter and dot emitting direction, it brings users low cost, high stability and long lasting red dot alignment perfectly.
https://www.berlinlasers.com/635nm-red-laser-diode-module
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