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If you’re a coffee drinker, or know someone who is, the 30.6 ounce Maxwell Coffee cans with the opaque lids make good laser cartridge targets. The beam goes through the lid and then reflects off of the bare metal surface on the inside, lighting it up. The outside diameter of the lid is approximately 6â€, the inner circle (the area that the beam passes through) has a diameter of approximately 5â€.
 

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LED flashlights work great as well.
 
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