dealsjewelry magnifier, 20x(12mm),10x(18mm) jeweler's…

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Looks kinda like a lopsided mustache...

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These things are cool. I actually got one like this, but it had way more magnification and it works great.

http://www.ebay.com/itm/Handheld-160x-200x-Pocket-Microscrope-Loupe-Magnifier-Mini-LED-Zoom-White-/360512488104?

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I have one of these,better made than I thought it would be, you can't go wrong for $4.

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These are great, instead of buying a big rock, just get a smaller, cheaper rock and this. Then tell them to look at the rock only through this thing.