Some green laser pointers not only emit a bright green beam but also invisible radiation at a hazardous level!
How do we make invisible radiation visible and how do you test your laser for this? Let's find out!

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Video on measuring wavelength of mislabeled laser:    • MISLABELED LASER | Power and wavelength?  
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FULL MUSIC CREDITS
Time codes: 0:00 + 2:18 + 9:18
Lightless Dawn by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100655

Time codes: 0:41 + 5:05 + 7:24
Neo Western by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100615

Time codes: 7:43 + 8:36
Impact Lento by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100619