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wonderful time with laser pen
http://www.kitlaser.com/the-dual-function-nanorod-LED-is-written-by-a-laser-pen.html
Here's a shop Wholesale Laser Pointer name Kitlaser, and I learned about the laser sensor from the United States (which, in the case of a disassembly, hangs a resistance divider that sinks 5V AC). The divergence increases the diameter of the distance of the laser beam from any plane of the beam at the intersection of the beam.
