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Why would you need a waterproof laser? Really, I'm serious. I'm sure there's a need, but is this a marketing tool or really a needed thing? I don't mean water resistant, which I associate with surviving a water splash as opposed to immersion in water. How often would someone need to use a laser...

Greetings, I am a Mechanical Engineer by trade. I'm somewhat of an old bird. My knowledge of electronics & optics is rather lacking though. Although I am adept at soldering and metal fabrication, my electrical theory is rather slim. So making/modifying lasers is not likely to happen anytime...