BlueDot Trading 20x Magnification Jewelers Loupe

Amazon.com Price: $6.17 $5.00 (as of 05/01/2018 14:40 PST- Details)

20X: magnification power ~ Lens diameter 21mm (.83 inches).
PORTABLE:Foldable and portable Loop (Loupe) Magnifier ~ Fits conveniently in your pant or shirt pocket, or handbag.
MULTIPLE USES:Ideal for jewelry, watches, coins, stamps, fine print, etc.