For my first RG yellow laser build, I used red and green laser pens from ebay like these 3pcs Green Blue Violet Red Light Beam Powerful 5mW Laser Pointer Pen | eBay . The red runs off of a 2x AAA battery pack but the green runs off of a 9v because of some heat damage while I was soldering it. When both beams are turned on, the dot appears lime green but shifts to red slowly because the green DPSS laser is temperature sensitive.
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