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Old 08-05-2017, 01:25 PM
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sil (Steve)
Not even a speck of dust

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Join Date: Jun 2012
Location: Canberra
Posts: 1,474
Hemlock, there is simply no such thing as a safe laser, even many torches can cause blindness. Responsible? try arguing that point with a cop or parent of someone whose child was blinded because of a distraction or child pulled on your arm while you were using it. If you are a biology teacher than you already know scientific instrument suppliers to purchase from, those may be close to the actual stated wattage value, otherwise just buy any piece of crap like most people. If you understood anything about photons then you'd know a laser is invisible and its dust/water vapour and other particles in the air that you are seeing the photons reflected off and 1mW is more than enough for that. Surely as a teacher you know how to answer your own question accurately instead of online forums.
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