Get the adjustable/focusable microscope, not a loupe, which is just a unadjustable little magnifying glass. For example, see http://www.ebay.com/itm/60x-Handhel...er-Magnifier-LED-Light-Trendy-J-/201613341025 for only $1.85 on Ebay. [It's incredible how for that price, you get not just the microscope, but 3 button-type batteries and delivery from China. Locally, just a single one of the batteries cost that much or more].
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