10X 20X Double Loupe Jewelers Folding Eye Gem Magnifier This is a new dual power loupe made of optical glass with a swing-away, chrome plated case The shape allows it to rest comfortably in the eye socket This has become the standard style of loupe used in the watch making industry and is excellent for any application where magnification is needed It is 10X power on one end and 20X power on the other The 20X has a 12 mm lens and the 10X has a 18 mm lens