I just want to share a safe purple 405 nm with the community. I will be using this laser with my Schlieren system I am currently building. The laser measures 3 mW using a cheap LPM. The power of the laser may be little over 3 mW but definitely less than 5 mW. First, I verified that my LPM is reasonably accurate by measuring a low power verified blue laser pointer. The pointer measures 4 mW on my LPM and the true power is 4.22 mW provided by the manufacture. The dot is barley visible during the day which is normal with 405 nm lasers at low power. The camera makes it appear bright but it is barley seen. I purchased the laser from AIXIZ and they are accurate and cheap 
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www.aixiz.store
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405nm 5mW Laser Module 12x30mm | AixiZ
405nm 5mW Laser Module 3.0VDC, 12x30mm brass casing
www.aixiz.store
