You can buy laser power meters and test on the spot, however there are some complications:
-You need to already know what the wavelength of the particular beam you're testing is in order to get the most accurate reading
-They range from $200-$800
-Even after testing, some really poorly built lasers (the kind that use filters to "tune down" certain high output wavelengths of lasers into other lower output wavelengths) can have filters fail and jump up in output
The "best" solution is to only allow brand-name class 1 lasers, however this is similar to enforcing a 300fps limit by only allowing tokyo marui guns.
It IS a solid method right now, but there's really nothing stopping anyone from modifying a class 1 laser to be a class 3 laser. And it's honestly not even that difficult.
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