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Old 07-11-2017, 05:12 PM
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bojan
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Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 5,976
Matt,
the "thingy" is actually 6mm laser with diffraction "cross generator", focused at ~20cm from lens.
Unfortunately, I already used it for my 3D printer alignment.

However, those things are easy to get on ebay ... This one is line only (possibly better for your application), but if you want cross, look here.
They are both powered by 2xAAA, 3V
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