Laser pointers
<ul><li>Red lasers: 635nm, 660nm</li>
<li>Green lasers: 520nm, 532nm</li>
<li>Blue lasers: 405nm, 445nm</li></ul>
<a href="//commons.wikimedia.org/wiki/User:%E5%BD%AD%E5%98%89%E5%82%91" class="mw-redirect" title="User:彭嘉傑">彭嘉傑</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>